About four years ago I built a rolling strong-back boat-building cart to use for my Shearwater Sport Hybrid build.  It has a welded steel frame with wheels, a materials tray at floor level, full-length tool shelves below the boat support area, and a ~14 ft wood I-beam strongback.  It worked perfectly.  My son just finished using it to build a canoe.  I'm enjoying not having it in my garage, but I don't want to get rid of it as I eventually want to build another boat.  If anyone in the Dallas/Ft Worth area is interested in borrowing it for a year or two for your boat project I'm open to that idea.  Contact me at kstrand at vsc-usa.com if you're interested.  I tried to attach a picture but not sure if it will work (because attaching a pic file doesn't seem very straightforward....)  Thanks.