It's do-able ... I used to do all our prototyping on a home made vac-former before we made the plunge and bought the real thing.
The best way I found was to clamp the lexan in a ply frame, heat it up in your over with the grill on max, not too close mind ... wait till the lexan droops around 2-3" and then drop it onto a sealed box with a vacuum cleaner attached and switch the vacuum on ...
.. and don't forget to dry the polycarb out first or you'll get loads of bubbles in it .... around 30mins at 100deg works well enough ...
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