The problem with that though, is I'm limited to what I can fit in my oven and even if I can, it's preferable not to have your food taste like plastic. Through some Google-fu I found tk560.com. He set up a table top vacuum former and heavily documented his build process here.
My build process isn't nearly as in-depth but some of the pictures I took are pretty.
The machine in all its glory:

Want to know what happens when you underestimate the power of homemade circuitry? Keep reading, I was in for a jolt!