Disclaimer: I assume no responsibility if you choose to build and use this . High temperatures and warm sagging plastic (polystyrene) can be dangerous if mishandled. Please use caution and be prepared when using materials next to a heating element.
I was going through some old files and found this image and figured I should throw it up. I actually built this several years ago and it served me well with all kinds of miscellaneous parts. The image is somewhat basic, sorry I don't have exact measurements. It all is based off the size of the frame that fits in an oven. This is a basic table that uses a shop-vac for vacuum. Cheers.