Alright, adopted the vacuum bed, and I'm a fan so far! Thank you @TEAJR66 for sharing your build! I opted for a 2" grid, with 1/8" holes in the middle and 1/4" holes on the outside and it works with a small floor vac we don't use anymore. My table that I salvaged for this made it particularly easy to make an airbox, only needed a piece of luan to cover the bottom of the frame. It's not uber-airtight but it works!