Amas - section

The top of the amas can be rounded, and the insides of the top and bottom boards can be routed between the bulkheads. Left flat on top where the akas will attach.

New amas - hollowing out

This is the layer below the top board, or deck, of the new ama. It and the next layer down will get hollowed out something like this:

Since I made those cut-outs, John convinced me to make the sides of the boat thinner, so in the next photos they'll look different.

I don't plan to cut anything out of the bottom board, since I want the strength and also the ability to make it smaller if I want, for instance at the bow vee from the keel up to the chine.

The middle crosspiece in the above photo is part of a bulkhead that will hold the sides from oil-canning. The crosspieces closer to the ends are for strength where the akas will be attached.

New amas 4

Hacking away at foam...

The black line is marlin twine. I used a hand saw to cut the bulk of the excess off.

Then, 24-grit paper did the rest:

That's it for now, I'll finish the outside when all the layers are glued up.

Next step is to take them apart, hollow out the innards, and glue them back together. Then final shaping can take place. I wanted to get an idea of the outside so I could dig out the inside and be confident I wasn't going to go through, or leave too little.