Chad,
Thanks for the vacuum forming info. This is an area where one never knows too much.
It is neat way to make parts that aren't available any other way or to replace broken ones.
Until I started using a shopvac, I didn't have much success - not enough oomph to pull the plastic over mold.
I've attached photo of my setup. Used 9x12 baking pan (wife didn't miss it for weeks - oops!). I cut pegboard for vac floor and siliconed heavily around edges.
The 1x2's are mounted from the bottom of pan with screwin rubber feet
See image 1