Yes I made the windscreen frame and had glass cut to fit it.
On my build thread here.
The frame extrusions I got from a company who funnily enough make the Caterham and Ariel Atom chassis etc.
Found out about them here.
A proper glass place can cut the glass to the curve required at the bottom. Mine was cut and ground for £35 (not marked post IVA).
Cheers
Stot