Here is the Low tech canopy theraforming
Designed by hpept
Low-Tech Thermoforming of canopies
A few months ago, "Hpept" posted a useful method of making clear canopies that doesn't need a vacuformer or a lot of practice. It works for me. With his permission, I've created a PDF of his post. Have fun.
If you have a variation or refinement of this method, post it here.