You cut an exact-size bulkhead, and cut the middle out
: (leaving a 1.5" or 2" wide ring that you glass into the hull aft
: the cockpit).

: You then cut another bulkhead (the "hatch cover") that is about
: 1/4" smaller all the way around. You can simply use thumbscrews
: through the hatch cover into T-nuts in the glassed-in ring.

Shawn,

Exactly what I was looking for...

I presume you mean that you cut the hatch cover maybe a 1/2 inch larger (not smaller) than the hole.

And for the mechanically illiterate, Like me,

a thumb screw and a T nut are pictured below.. I had to look them up to know exactly what was intended:

http://store3.yimg.com/I/chipcooler_1713_1275996 (Thumb screw)

http://www.oandp.com/edge/issues/articles/images/NEWS_2002-09-27_06/Dunlap-gripper2.jpg (attached photo)