I'd like to be able to raise the cage in my 300ZX in order to create some much needed headroom. There is about 1/2" - 1" that I can raise the cage by simply lifting it, but I can gain a lot more if I could just "make room." The GCR seems a little quiet in this subject except in the ITCS 9.f where it says that other than for installation of required safety equipment, no other driver/passenger compartment alterations or gutting are permitted.

What I'd like to do is cut out the areas of the ceiling circled in red, and replace them with new pieces/panels that serve the orignal purpose but allow the cage to be raised:





Any opinions on this? Legal? gray area? not legal?

Tm B