Hi Paul
The plans are electronic files, so you can¡¯t lay a pattern on the plywood, but it is really a straight forward process to mark the needed points with the included table of offsets. The lines between the mapped points are usually straight lines, and that makes it quite simple to draw a bulkhead. Then you cut out your bulkheads and brace them in place on the floor (the floor does not have to be level or flat). Then add your stringers and the structure you have made will tell you what shape the plywood should be. ?
It is surprisingly clear when you do it.?
Cheers
Patrick