Good luck.
I was looking at the car, lamenting the lack of space for electronics with a fan in front of the motor, when I had an idea. I think if you made a new steering pivot that sat higher, closer to the belt, with downward facing balls, you could do an east/west servo mount with the linkage going under the plate. I'm gonna give it some more thought.
Because the rear hinge pin pivot is so far back, it makes things a bit crowded with the steering. But there's a lot more room with the long topdeck than there used to be.
Where are you having rear grip issues? Entry/mid/exit?
-Mike