I dont know if this is acceptable to you but there are ways of strengthening a lexan body. I've seen fiberglass drywall tape and some type of glue (I can get the name if you need/want) used in the high stress areas under the body. You can also mount a body post on your diff case using a regular 4-40 screw threaded from inside the diff case on a TC4. Then you can file the post down and use a spare swivel body mount covered in some foam on the very tip of it. This 5th post doesnt come through the body but provides suport bewtween the wheel wells to prevent some flexing which is what causes the cracking at the tops of the wheel wells.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
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