When I was painting the Giant Spider prototypes for Wargame Atlantic I was already envisioning adding one to my Tau 40K Kill Team. I was a big fan of the old Alien Legion comics back in the day (essentially a sci-fi Foreign Legion mishmash of aliens of all sorts) and I like the concept of Tau auxiliaries.
The base of the conversion is of course a Wargames Atlantic giant spider. The kit includes sci-fi faceplates, bionic legs, and a weapon arm. I swapped in a Tau pulse rifle and aerial, some greenstuff (I wanted him to have a second grasping claw, which the kit lacks), milliput for the cephalothorax armor, and some plasticard.
I also dug through my backlog and pulled out Hasslefree's Maxine- who I never believed was human and has a suspiciously Tau-like gun.
The entire Tau kill team so far:
The Giant Spiders kit is pretty sweet, I was really happy to get my hands on the plastics! Here's the sci-fi version I painted for Wargames Atlantic for comparison: