[racingdwarf]

Think you are all on the right path, but I agree, there is a LOT of flex in the car already,anything you chop out or bolt on will weeken the join at that part of the chassis if you are using the original T-plate.
I think a thick as poss carbon fiber t-plate with the molding that the gearbox fits into bolted right through from the bottom of the car up through the molding then gearbox replacing the four screws, then all othere parts are quite simple to fit to the plate.
This way you will get adjustable anti squat, and make the car stronger.

Good stuff tho, and with all these ideas I think somthing good will come out of this