I`m thinking about a thicker chassis+topdeck since I own the car.
I built a prototype of a laminated tube chassis. I never finished it because it's really difficult to laminate it and very, very expensive.
Perhaps I'll start a second try this summer.
I chipped my chassis a few weeks ago (cars lying on the straightway are never good)
and now I'm thinking about an alternative.
I found a guy who is able to mill CFK and said he'll try it for me. Hope it works...