Good work on the front sloping cover. I'm mulling a similar idea for my truck.
For LEXAN, you might try rid-out plastics online.
Plexiglass sheets, Acrylic plastic, Lexan sheet, Plexiglass Fabrication, Fiberglass Panels, PTFE I ordered some thinner sheets from them (0.020") for my wheel covers. You could also search for a local business that sells corrugated plastics and such...
Polycarbonate Sheets Dealer | Lexan Sheet | Teflon Tube