Re: How do I build a flush hatch on my deck???
No on the mold. You can buy framed hatches that lie flush or nearly flush, if you're ok with purchasing.
Otherwise, you need to form a lip or rim for a hatch... there's a pic of how to make some hatch molding on the
www.bateau2.com forums, you can basically make it out of trim molding glued to melamine, or a similar setup. You wax your homemade mold, and use it to make multiple straight sections of hatch rim, which you then glass together into the shape you want.
You form the lip to hold up the hatch, and also to act as a gutter for water, then glass it to the underside of your deck, so your new hatch cover sits flush with the rest of the deck.
If you don't care where the water goes (like in a ski locker) then you can just make a lip capable of holding up your hatch cover out of aluminum angle or fiberglass, and make the cover flush with the deck.
It's a lot simpler to buy a hatch than make one, as you might imagine.
Erik