Re: Cockpit drain holes
By going custom fiberglass I question whether you're making things more difficult for yourself over using proven hardware and hoses. And a future buyer may look at it kind of funny. Although it certainly gives you more freedom.
I wanted to point out, and I think you may be doing this, that these extra cockpit drains need not be at the lowest point. If it's more convenient you could put them someplace above the cockpit floor, or mounted on a vertical surface for example. You really only need these extra drains when your cockpit really floods, sort of like the emergency drain on a sink or tub they can do that job even from higher up.
1979 Contessa 26