I was creating a table the other day that has a lot of plastic ramps (more than wh20). When we get around to doing a whitewood this is something that I'll be trying out for game testing, not with clay but wood for sharper finish. 42" oven would be nice but can be joined.
http://www.instructables.com/id/Make-a-good,-cheap,-upgradeable-sheet-plastic-vacu/
http://www.pinrepair.com/vacuum/
http://www.instructables.com/id/Make-a-good,-cheap,-upgradeable-sheet-plastic-vacu/
http://www.pinrepair.com/vacuum/