[OPG3]

Brother Mike, Most of the downdraft sanding tables that I've personally seen and / or utilized had a flat [perforated] top with an edge just an inch or so tall. I know McMaster - Carr has what they call "soft-latches" that you could mount on your base table and when the DDST is necessary, simply complete the "latching" to the perimeter of your DDST after you've removed it from the wall where it was hanging when you aren't using it. Those "soft latches" are super-nice and won't tear the belt loops off your pants.

Otis Guillebeau from Auburn, Georgia