Bridge crane: I like how this one is built so it can track back and forth. It has 2 beam trolleys on each side, all would have to be same size for the weight. Also I would make sure the bolts are rated Grade 8 bolts for the tonage.
Roller Stand by am4X4 -- Homemade roller stand for a horizontal bandsaw fashioned from a surplus jackstand base, pipe, flat bar stock, and a floor jack's front roller. http://www.homemadetools.net/homemade-roller-stand-3