Hey toolgypsy, if you find out any good info on a design for a down-draft welding table, I would love it if you would share--I have a nice table already built, my table was intended for welding/cutting/grinding---all of which would benefit the operator with a decent downdraft system.I have a couple pretty good designs for the cutting part of the table that I would be glad to pass along, although there are many other sharper knives in this collective drawer!!! Thanks, Andy