I am building up a Jumbo MFT and would ask for advice on the height of the open space under the top to allow clamping. The top will be supported by a welded steel frame bolted to a scissors lift platform. I want to keep the open space height to a minimum so the table can go as low as possible. I was planning on 6 inches, but noted that at least one J-MFT has 10 inches of clearance. What has been the experience of the FOG.