The weight of an F1 tub is about the same as a std class glider out if the moulds. I have made plenty of both

Yes, you can make a glider cockpit like a F1 tub but the cost will be crazy.
Where you currently have 3-4 plies of carbon kevlar in a Discus 2 you then need 15-20 and honeycomb etc to make the F1 tub.

Designing it to withstand the different crash situations is the problem.
F1 is tested straight ahead against a wall at something like 750kg and 15m/s. It only has to work like that, not at 45 deg
Likewise the side crash and squeeze tests.

A good challenge and should be done, but not the easiest to realize