ok cool and i gushed you leave a channel down the center for water correct ?
I was able to fit between 4-5 2" pieces in between each set of ribs, and I left at least one of the centre pieces slightly smaller so they would be raised off the bottom, they are just held up by being glued with PL Premium to the other pieces in that section, that helps water from the sides run to the centre. For the middle section I cut the pentagons, then just cut about 1" off the point, so there is a 1" high by about 3" wide channel running the length of the boat right in the centre.
To be honest none of that was likely required, as the boat bottom had more of a curve from side to centre, and I certainly didn't spend time getting every piece to fit exactly, so there are tons of gaps anyway, but at least now I know for sure.