Plywood

We need 15 sheets of 3/4" plywood for the formwork, this is not including any 1/2" plywood for the sandwiches.

For the sandwiches: we need 23 standard sandwiches, so that's 46 slices of bread, each of which is 9" x 21 1/2"

We also need sandwiches for the double-boxes (6):
12 slices of bread @ 20 1/2" x 21 1/2"
new foam wings (6 ea.): a = 20 1/2" x 15 3/4"
b = 19 1/2" x 15 3/4"
c = 18 1/2" x 15 3/4"

And a sandwich for the sail-storage bin (1):
2 slices of bread @ 37 1/2" x 21 1/2"
new foam wing (1): a = 21 1/2" x 15 3/4"
b = 35 1/2" x 15 3/4"
c = 19 1/2" x 15 3/4"