The skull is from the fantasy chaos warrior sprue.
The shoulderpieces are from the Ork Bionic Jar thing on the old sprues. (trimmed up a little)
The chest carapace is from the new chaos possessed sprue (hollowed it out)
His six-pack abs is a trimmed doem Catachan torso
His bionic claw arm is from the tech/combat servitor models.
Each of his legs is from a different marine leg set. One is a techmarine and I dont remember the other.
Backpack/powerplant is a Sisters of Battle pack for one of thier heavy weapons... flamers maybe
IDK.
The right arm is the bif beefy Catachan arm with a fantasy chaos warrior glove and weapon attached. (I may replace the weapon with a Scythe)!!!!
The gun is a trimmed down stormbolter with the barrels cut off of the front. The new barrel is made from a trimmed down mortar shell from cadian
IG heavy Weapons sprue.
The shells hanging out the side of the gun is a random weapon bit... don't remember what sprue.
The glass dome is an automotive light for import cars. I got a pack of two from Advance Auto for less than 2 dollars (US)
I need to finish the belt area and trim the neckguard a little. I guess I can beef up the cyber arm a little. The human flesh arm is stuck at that size... I added it and the "six-pack" abs to make him more bizarre and abberant looking. I kinda like the ungainly freakish look that has come from it.
I may add a few more tubes or power cables i guess.
Drake_Marcus: I intentionally gave the children big water heads. I wanted them to be slightly comically proportioned and eerie at the same time. I'm trying for a nice Nurgle mix of freakishness and sillyness. (hence the bubble fishtank head etc.). I do have the smaller skulls, but i just thought the zombie heads were funny and sometimes I see big headed little kids running around the elementary when I pick up my girl and I think of "bobble-heads"
so... the army is kinda subtle comedy mixed with absolutely horrible things..... just like life!
The Sentinels coold have had some impromptu repars on them.... they were my first models for the army and kinda test dummies for my color scheme so I just rushed the simple conversions I guess. I do have 6 more sentinels to work on... so I will add some shoddy traitor repairs (thanks for the idea
). And, since all of my sentinels have magnetized legs and weapons, I will be able to mix the repaired legs into some of the current ones and then some repaired tops into the good legs and add some balance !!! ya!! that's the ticket!
Thanks for the feedback so far guys!
The pointing guy's head is waaayyyy too big for my tastes. To be honest, the only heads that seem to work on the models you've but together so far are the two with the skull showing under torn skin. All of the other heads are far too large. This is especially true of the bare skull guys. I'd try the Brian Nelson skulls. Check out the human skull that comes on the fantasy Orc boy sprues. It's more aestetically pleasing and a bit smaller. 
Actually I've got a better idea! Get a hold of the skulls Brian made for the new Chaos warrior sprues. They're nice and small while keeping the detail you'd want for these guys. Throw some rotting flesh on and you're golden.
Go for it. Just keep something consistent across all of them, be it the grass or the colour of the rocks, whatever, and they'll look great.
The color looks like a light mint color when mixed. Vallejo makes a color close to it.. its model color green grey (106) 70971.
