New Model Making Equipment!

I picked this up on Ebay to vacu-form parts for a possible upcoming kit.
I have experience with vacu-forming, when I was five years old. Mattel made a Vacu-Form "toy".

What could go wrong? It's UL listed so it has to be safe!
Give a five year old a hot plate to melt a plastic sheet. Flip over the plate and pump the vacuum arm up and down sucking the plastic over the master form.
I'm hoping for better results with the wood box and my shop vac.