I've been working on building a vacuum former, on and off, since about November. Prior to today, it was still just a pile of parts -- it's now operational.
The former is build out of Home Depot aluminum, a cookie sheet with holes drilled in it, a portable grill/crockpot thingy, and massive shop vac.
It's pretty much a monstrosity. I tried to keep it small, by reducing the height of the lower box, but then ended up finding out I didn't have enough space to get the vacuum tube to turn... I then found these great adjustable legs, from a commercial range, they brought up the height a bunch, and made it easy to plug the tube in. They also add a bunch of weight to the bottom, making it quite a bit more stable.
Unfortunately, you'll have to wait a bit longer to see some of the results, as I didn't get around to snapping shots of Nelson's face plate.