Ms. MAK 20SF

[FLexpat]

Not sure about the 20 but on my 23 it was 2 layers of 5/8" stapled together. Something to think about; You are adding a pretty good sized lever arm with that platform and you really don't want the transom flexing but you are right to be thinking about weight. The volume of the 1.5" transom in my 23 is 3 ft3; 78 lbs of Coosa 26 and 100-120 lbs if plywood. A 1" Coosa 26 core would weigh 50 lbs for a savings of 26 lbs. over the 1.5" coosa. Not a lot of weight savings, maybe a little in $.