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For casual use, even drywall is rated for vacuum forming temperatures. A bit of metal shielding around the heaters should be all you need. Old stove elements make good heaters - running at 120 V they don't glow. The most important thing is to put a fan inside the oven, with the motor outside, to get even heating. Another neat trick is to use a length of I-beam drapery track extending out the door of a narrow, tall oven. You can use cheap paper clamps and drapery rollers to suspend a sheet or a frame, and then slide it out into position for drawing. The clamp can be hinged from the bottom of the mold.
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