thanks,
Nick has provided a nesting layout along with his offsets. I've already re-nested the panels (on virtual paper) in several different ways in order to try to minimise the amount of sheets of ply that I might need. I tend to be a packrat so I seldom throw out scrap pieces of wood from whatever I build.

Based on what you guys are telling me, I'll probably do a 6"-8'-8'-6" partitioning. The ~6" sections can be cut out of the "scrap" areas of the main pieces, and I might get creative with what I scarf together for those areas while I'm at it. It doesn't look like the panels get too tortured in those spots.

Anyway, I think I'll use 5.2mm ply for the hull bottom and sides, and 1/8inch ply for the deck and decksides (tumblehome panels) rather than to just use 4mm ply for the whole thing. Besides the 5.2mm ply is a light color (pine, probably) and the 1/8th inch ply is dark luan. I realize that most recommend buying bs1088 marine ply, and that the difference in cost is minimal in the big picture, but this is my first build and uh, well...

I should have very little ply left over, and what I do have left, I'm sure I can find a use for, sooner or later.