For starters, I just cut out
two sides 16' long by 16" high. The leftover panels of 16"
wide by 8' long were then cut lengthwise diagonally.
(Sorry - I forgot to take
photos of these steps.)
Then one piece was flipped
over, they were glued big end to big end (to make a long,
skinny diamond shape), and then I cut the bilge panels out
Two pieces or 3mm ply, with
virtually zero waste!