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I'm thinking, just thinking of Maby attempting to build one of these two for a pre heresy army I have been working on. World Eaters. Not sure which one though or quite how to make it. I mean the imperator is much cooler and stronger but it's gonna take so long to build on account of the size and the whole dam city on top of it. A warlord looks like more of a war Titan and would probably be easier. How should I go about doing it though?

depends on how much detail you want it to have. If you want the rough outline, and 3 vents and one aquila, then, cardboard will probably do. If you're looking for moderate detail, card stock, and then, of course, if you are looking for a high level of detail, you'll need plasticard, though you'll be able to get away with using slurpee cups and possibly other types of plastic in certain places. I imagine you using some sort of wood to construct the base frame to give the entire thing some kind of support, or at the very least maybe some thick-gauge wire...

You don't have to stick to one. Mock ups are easy with paper.

I've even plated over sections built in card stock with last I card.
I'd probably last I card legs and use a mix on the torso & arms. Stability long run.

Don't forget about foamcore. It's lightweight and reasonably strong, especially with proper internal bracing - if you search for WIP titans of Warlord scale and larger, foamcore is used quite frequently. For larger builds, PVC pipe lengths and fitting are a popular choice for building a sturdy skeleton around which the titan can be fleshed out (foamcore for bulking out the rough shapes and plasticard for skinning and detail). For Warlords, the scale is just small enough that many people forgo the internal skeleton without issue, relying instead on a stable pose and laminated foamcore and/or plastic legs for support.

As a precaution, how much work have you done doing mock ups already?

Tackling something like this is really really not for the faint at heart as they are huge time and energy demanding projects. Unless quality isn't as important as general look of the model, then have at it!

For the outer surface, sheet styrene (plasticard) is pretty much the only viable choice. Everything else is either a pain to work with or looks like crap.

Inside, you have more options. If you make the entire thing out of styrene, it's much easier to get the outer shell to stick to the inner structure, but you will need to source some sturdy box section rods, which don't come cheap (although a project like this is not one to skimp on the expenses). Alternatively, you could use balsa wood or foamcore (light, easy to work with, not too difficult to stick styrene to). Having tried attaching styrene to metal and PVC, I'd suggest avoiding them unless you absolutely need the extra strength.

They have an imeperator in the window of the Manchester store, it's taller, ang just generally bigger than a person, so unless you take a transit van and forklift to your games I'd say your stuck with the warlord,even with that you may want to think about a wooden sekeleton to hold it together.

Attaching the styrene shell to a sub-structure of a different material all comes down to having a good plan for the joint. Pins and CA or epoxy become your go-to method in short order. Roughing up PVC with some sandpaper is a must for getting epoxy to stick well.

Corrugated styrene is available relatively inexpensively for use as bulk and for large surfaces. You can bevel the edges for joining two pieces without the corrugated core showing and then you use strips of plasticard to cover any exposed edges. Basic styrene cement is all you need to work with it.

The guns all come down to aluminum, brass and plastic tubing with plasticard details.

This guy used wood for the frame, scroll down:

http://www.belloflostsouls.net/2009/02/showcase-40k-scale-imperator-titan.html

I'm probably going to base the design of the Titan manufactorum titans: http://www.tsipisgames.com/shop/warbringer-maximus-mkii-no-weapons-free-shipping/ il use. Modeling foam/styrene for the shape and then use plasticard for the over layer. Bend it using heat. Not sure for the head...