I need stepby step plans to build a 2'x2' thermo vacuum box can anyone help?

I also need to know how to build heating element for this size box and where to purchase the plastic. Thanks

Do a search for "vacuum former" right here on Instructables and you'll find lots of ways to build them, and the different heating element options. If you don't find what you need here, check out the guys at www.ezonemag.com/forums and search for vacuum forming over there. Good Luck.