Here is is, the first Crisis Suit team converted up and completed. I'm pretty satisfied with how they came out, all in all.
The only real conversions are the legs and thrusters, and those aren't too huge. Cut plasticard tube, add extra joint. The thrusters involved measuring a bit of rectangular plasticard tubing, and angling it correctly. All in all, the toughest part was getting the legs to set, look right, and line up. Hence, some of the guys sitting on plasticard strips which were then glued to the base. But, hey, the result's a dynamic pose, isn't it? So it's worth it, in my opinion.
The missile racks are stacked plasticard tubing, in part because I like the triangle a bit more for an arm mount and in part because of the potential scarcity of those. The plasma rifles are the stock plasma rifles, largely because I think those look plenty Tau. Looking back at it, I think I have to claim inspiration from the ESWAT/Ghost in the Shell armed suit for the legs.