by JunkMan » Fri Nov 17, 2006 9:45 am
Mike,
I would think that the laminated plywood would work, as long as you end up with the same thickness as the framing that you already have in place. I used 3/4" 10 or 11 ply Baltic Birch plywood for the framing on my doors, and it's thickness is a little different than the 1" dimensional lumber that I used to frame the sides. I know that at least one tear has been built using plywood, that was cut out, for the framing, so they didn't have to deal with joints on dimensional lumber.
Can't help much on the hatch, I'm still building mine, and haven't quite figured it out yet. I'm not putting any "ledge" at the rear, the hatch will fit inside of the walls. If you want a ledge, I think it all depends on how thick you want your ribs to be. The thicker they are, the heavier they will be to lift when you open the hatch. I am making my hatch ribs out of 10 or 11 ply 3/4" baltic birch plywood, so that I don't have to deal with any splices in the ribs. Mine are only going to be about 1 1/2" wide (thick?).
Jeff & Odie
Black Hills of South Dakota