I was chatting with Mike this weekend about his "FIre" and all the Lexan that was in it. Aparantly, All the Lexan in that machine is  fragile and usually needs to be replaced. BUT the replacement parts are lots of $$ or are impossible to find (from whay I understand). Well if you have the patience you can do it yourself. See here http://www.halloweenfear.com/vacuumformintro.html

I've done it. with a wood frame, weatherstrip, oven and a plastic bin with a hole bored in it for the vacuum.

It's not hard. Marvin has this information for the low budget method.

http://www.marvin3m.com/vacuum/index.htm