Nice idea, very Orky and humorous. Overall, nicely constructed and well thought out concept.
The road surface (cork I believe), looks the part in texture and painting. The broken pieces are a good idea, but the three larger pieces could have been positioned better, they look a bit too much like they have been placed there (unlike the smaller pieces at the edge, which look naturally broken off). Also the shape of those larger chunks are a bit too straight and could have been roughed up a little to look less cut and more broken.

The road markings are a good touch to give it realism and scale. However, I can see where they were added afterwards and have not quite been covered up in painting the dirt that should be obscuring it.

The positioning of the gravel and dirt and rocks feels natural and work well. The big boulder, however, still looks a bit too much like a ball of paper towels up close. From a distance it looks the part though. You could have used a real rock for extra points (for using a material that required no modification or painting).

The blood and gore are good. Looks real enough and the positioning gives a sense of the splat. The trail to the helmet (nicely painted too) is a nice touch. However, where did all the rest of the armour go. Maybe an arm or leg sticking out from under the rock would have sold the idea that the armour had remained under the rock and the inside had been squeezed out like a tube of toothpaste.

The sign is nicely built. Good use of rivets. Simple, but nice ladder. Good addition of the sign/junction number. I'd have liked the white markings on it to be neater, but I'll give you the benefit of the doubt and say that they were also done in a rush by the imperium. The Orky marking is suitable for Orky, but could have been better/arty, maybe not, matter of opinion.
The small wood sign is good also. Such is the advantage of coffee stirrers and the like.

The rear of the sign is nice, with some good little touches. The bird's nest is good, but could have been better with some finer elements ("dried grass" or "feathers"). I'd have positioned it differently; birds tend to like to place their nests in secure places where it can't be knocked over easily. So I'd have put it more into the corner (or even on top of one of the posts) rather than on the flat surface, unsupported. I do really like the pattern you got on the egg though.

The Ork, is generally good. The clothing and metals look well done. His skin though, could have done with another highlight layer to give it a bit more definition, especially on the face. The sandwich is great though. Maybe could have done with another layer inside so that he's holding it a bit more firmly.
The lunchbox and thermos are nice additions. Could have been a little neater with the construction (the gap at the top of the thermos draws my eye in particular). Painting could also have used a bit more detail (highlights on the red for example).

The rust and dirt on the platform could be improved with some washes (red/brown for example) and more sparse orange flecks (they look more like the Ork has been walking red paint about the place, rather than rust).

Overall, a nice, fun piece. Can work as both a dio' and playable piece. With room to expand upon for a full table.

Good work, once again showing us why you are the king of all riveters.
The bridge is a nice construction, looks pretty neat and solid. Moving parts are always a bonus, and the design of which looks like it functions well. The riveting looks good and is very straight and regular (with only a couple of little wobbles). The recessed rivets on the road areas are good for practicality and look good, although could have been improved by adding smaller diameter rivets in the holes. The linkages for the chains were a good idea, I sadly don't come across that many bras at the moment, but will keep it in mind for when I do.

The painting on the bridge is nice. The metal is very good, although there are a few spots of red that are a little too bright and could have done with toning down (probably just a splash of brown over them would have been enough). A few flecks (and I mean very few) of orange might have been good for some variation. The green is a good choice (I'll come back to the green later), although it lacks some depth and some areas could be smoother. You appear to have tried some weathering on it with some washes, but you could have gone much further with it (I suspect that you didn't want to overdo it?). There's a couple of sections where you have a dark run down one side and along the bottom; if you had done this, consistently and logically, over all the sections of green it would have really looked good. As it is, it looks a bit like you slipped when washing the metal (these sort of things should be embraced when weathering as splashes and runs will often "fix" themselves to look more natural than you can achieve by hand).

The ground around the bridge is a good effort and is effective from an overall view. The grass areas look fairly natural and not "forced random". Good idea on using pencil shavings for that, I'll remember that when I come to doing large areas. You do appear to have got some variation to the grass colour, but that could have been stronger, as well as adding some brown/bone dry-brushing to areas/edges to show dying patches. Random patches of tall grass or small plants would have added some nice variation and realism, especially along the river bank where plants tend to get carried away.

The road/mud/sand/dirt needed a little more work. But I realise there is a fine balancing act here; playability, disassembly, realism, cost, materials, etc... The roadway is fine as itself, good gravel texture, nice colour (but could have used some more variation in tones). The flat areas where the bridge fits is fine, it needs that to sit flat, but some build-up of gravel around the base of the bridge to show that it is a permanent feature; this could be stuck around the edges of the bridge rather than on the base, meaning you don't have to position it perfectly each time. Also, some dirt from the road could have been added to the lower parts of the bridge's ramps, to show it being dropped up there by vehicles passing over it. Unless that troll is particularly anal about keeping the bridge free of dirt.

The sandy coloured areas that surround everything, being flat doesn't lend itself to realism. It does make it very playable, I'll grant you. But a little texture would have really helped. While you could have covered the whole thing in varying grades of sand/gravel/etc. (which is what I would have done), you could have used the gravel from the road and put it down on the patches you have painted that colour, leaving the sand coloured parts flat. This will have added the texture that you have represented with paint and lifted the whole piece easily. Again, more variation in tones for the sand and dirt across the board would have been a good improvement.

The river, while you seemed disappointed in the cracking of the surface, it is a nice effect for a frosted over (or similar) look. With the barren look of the short, patchy grass, the frozen over river works to give a kind of cold wasteland. With some light grey/white dry-brushing, it would really sell the frosty look.
Or, due to it's colour and that it needs a bridge to cross the modest span, it could be a horrible chemical river that forms a hard crust at the surface. That explanation works quite well with the texture you have there actually. I like the variation in colours you got in the river and that makes it look all the more real, even with the cracked surface.
I would have done the river much wider, at least beyond the bridge (build a bridge at the narrowest point), as it is, the tank looks like it could cross the river a might not even get wet.

This brings me to colour. The whole piece could have done with a bit more colour. With the green grass, green bridge and the green troll in his green-ish river, the only thing that stands out is the red tank. However, it is a hard decision with your piece; Trolls are generally green, grass is obviously green, a dirty, polluted/chemical river is often green, and I've already said that the green on the bridge is nice by itself. With the metal of the bridge and the red-brown road surface both being fairly muted, the whole piece looks very green.
Also, from a distance, the grass almost blends into the sand as they are both light colours. Giving the grass areas a wash of dark green (before dry-brushing up as I mentioned earlier) would have given some contrast between the grass areas and the sand between them.
The troll probably should stay green, I'll come to him in a bit.
That means that the things left to look at are the bridge and the river...
Changing the colour of the bridge is tricky, as the green contrasts with the red-ish rust. But with all the green around of the grass, you probably don't need it on the bridge as well. You can't really have red, as it would not work with the rust and the road and the tank. Yellow colours would then blend it in to the sand of the base, so that doesn't work. Neutral colours (grey, etc) would work, but would not make the bridge stand out, and you want it to stand out. So that leaves you with blue colours, and I think a nice deep blue would have made the bridge stand out and scream "look at me", and would then give you the primary colour triad (red, green, blue) on the piece.
And then the river, mostly fine (if the bridge was blue). Could have been bluer to bring in the blue that way, but may have overshadowed the bridge then. The river could have gone more toxic yellow though (you may have had to change the sand's colour then) to get it more like a sulphur lake thing. In fact, look up sulphur lakes for if you use this technique again for "water", so many colour options, but they would over-power the bridge in this case.
So it is a tricky piece to colour, but is only really missing one more colour (possibly blue).

The troll is nice. I like him. Good modifications and the weathering on him works really well. Good effort on the glow inside his boiler and the hammer is good. Well done.

The tank is another good build. Good use of parts for the boiler and chimney. The tracks could have done with some detail to show the links/hinges. The painting is generally neat, but the brass could be improved and the red needs some highlighting. It's an interesting shape, but the gun turrets don't really fit with it. The tank is all square and boxy, and the turrets are round. In a way, it would work really well as a civilian vehicle, without the turrets, or maybe with some differently shaped turrets (to fit the square aesthetic). Good effort on the weathering/dirt. A wash of light brown, left to settle into the corners. would have improved the look of dirt getting into hard to clean corners (and avoid the clean border around the white panels).

Good work. A nice, very playable, well built, piece of terrain. Good to see you trying more out of your comfort zone. A few more added painting "tricks" and you'll be heading up to the next level.