I'm going for the full composite chassis.

Having had a look over a Murtaya which is mostly chopped strand mat, its not that difficult to make it stiff enough. The murtaya is fairly basic. Things like the moulded strut towers are only like 3 or 4 mm thick fibreglass and the same for the subframe mounts. Hardly massive technology in thier design either.

Mine should be a nice strong box section construction with triangulation to stiffen it up.

10mm panels is minimum IMO. Plus things like strut towers will have metal plate inserts within the carbon to strengthen it even more.