: If you read the first line it says to use the full length 8' 2
: 1/2". So, am I correct in assuming I have to make it longer
: with non-marine ply?

: Rough Cutting the Panels

: Cut from 4 sheets of 8 foot (actually 8', 2 1/2") by 4 foot
: marine grade 4 mm Okoume plywood:

: 8 pieces that are 11 inches wide and 8 feet (use the full 8', 2
: 1/2") long. Four of these pieces are for the side panels
: and 4 for the bottom panels. These pieces will use up the first
: and second sheets of plywood.
: 2 pieces that are 12 inches wide and exactly 6 feet and 3 inches
: long. Lengthwise (6 feet and 3 inches long), the center panels
: are a final cut, not a rough cut, so these final cuts should be
: made cleanly at right angles. Each piece needs one straight edge
: lengthwise, so cut them out at the 2 long straight edges of the
: 8 foot by 4 foot plywood. Mark them as the center panels for the
: deck.
: 1 piece that is 22 inches wide and 7 feet long. Mark it as the
: stern panel for the deck. This piece and the 2 pieces from
: number 2 above will use up the third sheet of plywood.
: 1 piece that is 17 inches wide and 5 feet and 6 inches long. Mark
: it as the bow panel for the deck.
: 2 pieces that are 11 inches wide, and 2 feet and 6 inches long.
: Mark these 2 pieces as the bow end of the side panels. These 2
: pieces and the piece from number 4 above will use the forth
: sheet of plywood and leave enough extra for the cockpit coaming
: lip and bulkheads.

Regardless of what size the orriginal plywood panels are, you still make the hull pieces the correct length as stated on the plans. The only difference will be the location of the scarfs and that shouldn't matter in the least.

Plywood panel length will depend on who makes it, the normal size is 4x8 and I've got several sheets of marine grade ply that's that size at home. Obviously some mills make it longer, but I've not run into that.

Bill H.