I know what you're saying that, its going to be like an egg shell. My test piece mould is similar to some degree. 1 ply of 200g diolen is very floppy but in that shape all it will do is pop in and out a bit like how a car bumper will rather than flex due to the shape as you say. It actually destroys the resin because the fibres are able to be abused like kevlar. That's why I as going to use it, to keep all the sharp bits contained in a big crash and avoid  cutting my throat on a broken cockpit edge. I'll get some of that wobbly resin to try out!