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Have you ran an FEA with nodes further back where the suspension pick ups would be.
Awesome looking car, but IMO I think a little more diagonal bracing would give a bit more rigidity. What dimension...

Question,
Are you planning on supporting the main roll hoop any higher than the existing support tubes shown in the cad drawing?

If not, you may want to reconsider bringing them higher to...

Truly a very professional build. Excellent work!
Believe me, I know how much time and effort you have put into this. I'm just finishing a ground up build of a two seat P2 car.

Unless you have...

Superb work Jon! That baby should be very quick with that minimum amount of frontal area. Any concerns on cooling?

Cheers
Linz

Chris I typically use .875 .065 wt. 4130. (Full aero DSR) In compression this section size has massive strength it will provide the strength you need for an open wheel car.
I wouldn't go lighter...

You should not use chop strand with prepreg. The prepreg is an expoxy resin and the chop strand requires a polyester or vynal ester to break own the glue that is used to hold the chop strand...