I recently made a beam box/torsion box assembly table with adjustable legs. You might be interested in some of the things I did. I started with the David Marks DIY design but cut the grid differently and designed and built some adjustable legs. Sorry about following two links, but could not do a cut and paste:
http://www.ncwoodworker.net/forums/w...le.w.pics.html
http://www.ncwoodworker.net/forums/w...ne.w.pics.html