I like them. The headless chaingunner could fit into Quake (the Quake world according to some), after all chainguns are an old staple in id games. I'm not sure why original Quake had no chaingun or at least supernailgun enemies. Probably because the original concept was more fantasylike and the scifi militaristic stuff was stuck on at the last moment. The supernailgun in Quake also was 100% accurate which for an enemy would have been out of line I guess. After all, nail ogres were also removed.
Quoth had the Edie which worked OK, but a dedicated new model would be in order IMO. The fact it is headless is very Quake to me.
The 50s style robot is cool, and much more kinky than Rubicon's. Great idea putting the backpacks on there, actually. Very world war like, reminescent of a Tiger tank in the colouring and the bulkiness.
Also, the chaingunner reminds me of the crude, rusty cyborgness of Quake 2.