Please post contact info about the guy making the Scarab Excel screens. I'd like to reference it just in case I ever need one. I know Viplex in Sarasota was the original OEM for the 1990 Scarab Excel models, my 28' and current 34', but the company was sold/merged, and then disappeared from what I could find via the internet.
I know when I ordered one from Viplex back in the 90's, the shipping cost more than the screen. I seem to recall it was $250 for the windscreen, and another $300 to crate it, fork it, and ship it. Huge box, delivered by tractor trailer and my marina forked it for me on this end.
As for if the piece will fit, I can't say it would for sure either. Might suggest you ask him for some precise measurements and angles to get a better feel if it will fit.