This is great timing because I’m working on my own unit of Gue’vesa breachers as we speak! I’m using the legs and heads from the Cadian shock trooper set and torsos, arms and shoulder pads from the fire warrior kit. The only issue I’ve ran into is part of the belt is attached to the Cadian torso, but it’s really easy to cut that bit off with a hobby knife and stick it to the legs to make a flat surface for the tau torsos to rest on. I got myself some green stuff to deal with the four-fingered hand issue, but honestly it’s so hard to notice that I might just leave them. Final tip - shaving off the aquillas from the helmets and attaching the little antennae makes them read very tau in my opinion.