Don and David,

If the Vixen doors are basically the same as the Super Sport, then the standard "flat" plastic panels (polycarbonate/Lexan) have a simple straight bend in the middle to make the panel follow the contour of the frame. That bend can be simply cold-bent in a sheet metal bending brake, or a press brake... no heat required. I'm sure that is how the factory bends them. Very easy if you have access to a brake. The stuff is very tough... you'd be hard-pressed to make it crack, even if you were trying.