Neat idea for reinforcement. I'm guessing this is a track only car? If not, you'll hate those solid tranny mounts.
12's are doable with stock turbo. I was close but never got there before I started big mods. Trapping close to 100mph in the low 13's. I never had hop issues in that car though. In my experience the biggest culprit for wheel hop on the FC is the front trailing arm bushings and shitty old shocks + one case involving the main diff mounts.
I would also bear in mind that with the pinion snubber, on a hard launch the front diff mount won't really be doing much. The main idea of the snubber is to provide support for that mount without having to run comp mount or solidfy the stock one. The mount nees to be there during regular driving to keep the diff pointed the right way though.
It should be bomb proof. Now prepare to break all the things that were bomb proof before!