Try experimenting with some smaller pieces in an oven. I have a friend that does this when he makes windshields for motorcycles with great success. You have to find the right temperature and duration of the heat soak to get the Lexan into it's 'plastic' state so you can bend it. You should have no problem once you try a few pieces.
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
SOLAR TECH ENERGY SYSTEMS, INC.
AM SOLAR ...MAGNUM…VICTRON ENERGY...LITHIUM & LIFELINE BATTERIES…MARINE REFRIGERATION