Here's a question about the chassis in such cars: what kind of a difference is there between the chassis from various manufacturers - is it just the build quality, or are there actually differences in the design? How strict are the rules for such a design? Obviously they don't have anything in common with the road car - not even the suspension geometry I believe (?) - but, how (for lack of a better word) "spec" are they?
Is the actual age of the design less of a factor with these cars than with other racecars?