Make some of it look more organic, and maybe have a kind of spine like thing running through it, add in some form-follwing corrugated tubing, and obviously, make the gun much more Phalic, then you'll be shooting closer to Geiger style. These however are still quite impressive standalone works of art.
It's not Geiger, but it's a very compelling look. It looks quite insect-like, and somehow it even reminds of me of scanning electron microscope photographs of minute arthropods like skin mites. It also looks quite turtle-ish, and the overall impression of someone deeply fearful, who wants to be as completely protected from the world as a turtle, but who is also somehow insectlike. It may not have been what you first had in mind but it's real real good.