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02 / 22 / 00 The main hatch cover on top of the cabin was built in the same fashion as the fore hatch.  I used 4/4 mahogany for the frame with a 3/8" plywood top rabbeted into it.  I used miter joints for the corners.  They normally are a week joint, but I have screwed them together and with the top rabbeted into them the joint is quite sturdy.  In fact the hatch cover is way over build.  It is fairly heavy and very substantial.
02 / 22 / 00 I wanted my grab rails on the top of the cabin to stand alone and not double as hatch rails, so I made separate hatch rails. A sketch shows how they fit.
02 / 22 / 00 The hatch simply slides along the top of the cabin under the rails. It is difficult to see in the picture but there are small scuppers on the rails to allow water to evacuate.