Ive plenty of the raw material data, bonding adhesive and relative joint data for joining panels etc as well as chassis inserts.

In terms of the FE i was going to us the parameters used on a couple of chassis design reports a uni did on relative stiffness and relative performance of OEM chassis versus a student designs. They used a set of parameters used by MIRA and others to model OEM designs, so that should do the basic performance. Its some ISO test standard from what i was reading...

Crash performance I need to find some test data on road use. At the moment i only have the minimum criteria for various motorsport and formula requirements for crash structure performance.

Over engineering it is the biggest danger considering the chassis designs ive seen and my initial design thoughts.