Rails a little thinner than the Naish and quite a bit harder. I used the proven rocker from my 277, well the last 5 feet of it anyways. I mostly left room to adjust forward.
Center fin fairly aft.
LE of side fins near aft end of back footstrap. I used future systems boxes and fins, cheap and easy to install. My side fins are fairly big. More 4oz s-glass over fin area, inserts and heels. Vinyl ester resin.