Unless my search has missed it, there has been no reference to the use of steel studs as strongback parts. The header pieces have no access holes, and only a small incurved lip on the edges. This would allow them to fit flush to plywood sides (or tops) if a shallow kerf were cut. Question is whether to use all steel, or combo of steel and wood. Also, the self tapping screws used to fasten them would seem to need entry holes drilled in the outer piece to insure close fit. Perhaps even flat head screws, to eliminate the semi-round heads that could be annoying later. Extensions could be easily slipped into the ends for longer boats. Ahoy, great minds, any ideas, thoughts, experiences? (Paul: I made sure the paper feed tray is full, so have at it?) Should make a strong, lightweight unit.?.? TNX thoughts, Scotty