Extra Transmission support

It turns out that my aluminum floor is not legal for the class because the rear tranny crossmember bolts to it and becomes load bearing, and aluminum is not allowed for load bearing structure. I simply added 1"x2" steel tube between the transmission crossmember and the frame rails and the problem is solved. The rest of the floor is held in with threaded aluminum rivets but for the crossmember, I welded 8mm nuts to the frame so it would be more secure.