Jeff - one diff right off is that GMCPaul
says 12 boards wide but only lists/shows 10, and mine was 12, not exactly symetrical, and he shows sizes being 4½", 5½", 7½" where mine were all even 4,5,7" - which would account for greater number, his lengths differ from mine, tho he may have left room for expansion [which won't happen lengthwise]
can do, but hafta lay it out a liitle better than my 3x5" sketch

also waiting on the skid strip set I ordered locally to see if they're right length and #, tho they can be fudged
Bill