Weeeeeeeelll, I may have an army like this. For terminators, I used the standard chaos terminator lower, and used rat-ogres for the tops. You could probably then add stuff from the gun-mounting ones whose name I forget for a little more fluffy looking stuff, or bash in termie bits. Mine looked like this, left to right, lightning claws, Heavy flamer/power fist, Termie lord with broken off oversized chainsword as a demon weapon, and another lighting claws guy:
I also flipped it to really stretch the kits, and had rat ogre heads, arms, and legs mounted to the terminator torsos, but those look a bit goofier...
I also have a Huron, a Kharne, and one other I forget kitbash/conversion, but didn't do any of the others you're asking about.