Guardsman is to be basic muscle for an Inquisitor Retinue. The Techwraith is more interesting. A daemonhost-like creature, but with a tech-feel pointing towards Mars possibly.
Inspiration for the Techwraith comes from the original Ratspike artists, Blanche and Miller.
I am not there yet with the conversion but I think the imagery featuring spheres, tech bits, spikes, and ragged cloth has a lot of potential.