How about a step by step, for folks that want to build their own?
Here's day one:
Buy a 1/4-sheet of something thin at the lumber store- I used 1/4" luan (about 3/16" thick) last time, and grabbed the 5-ply birch stuff this time. Also buy a small sheet of foam, 1.5-2" thick. In California, all they stocked was white EPS; here, all that's available is the pink XPS, and I had to buy a whole sheet. The white stuff shapes faster but is more chunky, the pink stuff is more expensive and tougher. I'd pick the pink, given a choice.
Print the patterns on letter sized paper, and cut out each one. Make you scissor cuts through the little extended vertical and horizontal lines- you'll line those up with similar lines on the plywood.
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Cut the plywood. Cut one 5" strip for the centerline "spine", and (17) 5x7" pieces for the "ribs". Cut these parts very carefully, using a stop block or fence setup to get them really square and really identical.
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Draw the layout lines on the plywood. Very carefully draw the centerline, and a line that will represent the horizontal datum on all the blocks. Test fit station #8 on one of the blocks, to see how high up to draw the datum lines. Then use spray adhesive to mount the patterns to the plywood.
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Total time so far, about an hour and a half.
Tomorrow, I'll cut the notches for the egg crate assembly, and shape all the ribs and spine.