> I went even further and laid the spacers up over a sheet of wax paper on
> the boat. That way you can take it off when cured and grind away. I did
> the same for the top ply. One trick is to cut the cockpit hole undersize;
> use your completed coaming assembly to mark the deck for final cutting.

We think alike, as I did the same with my Ches16. This made for a nice straight, smooth ply appearance on the outside, which I think, is very attractive.

I finished off the heavy sanding with the top single piece coaming glued on. I used heavy 60 grit "barrel" sanders attached to a power drill to sand the inner side of the coaming and deck. Still lots of work, but the smooth, correctly beveled layered inner edge looks great.