| Have you tried clear plastic pop bottles, make sure they're empty first. You can get a fair sized sheet out of a two litre one. Its only thin but you should be able to pull a fair depth if you get the temperature right.
Costs nothing, and you have nothing to loose. I have used it before now to form gun turret canopies for model boats by heating it up and stretching it over a male mould, with about 50% success rate, but if you are only after one or two it should be ok.
John |