Well, I may absolutely hate the fluff for the tau, but those are definitely some interesting rules. I may have to start working on my human tau-count-as army.
Just putting out some ideas for criticism:
Heavily-Converted Terminators as Crisis/Broadsides
Converted Necron Androids as Kroot and Demiurg
(If they ever do it) GK Warrior Acolytes as Firewarriors, assuming they come with a lasgun and carapace.
I love high-tech.