Deck Hatches
The plan calls for coamings (3 x 6 mm) to be glued around the edge of each of the hatch openings. Strips of mahogany were cut to size and mitered on the ends. The mitered corners of the deck planking helped with getting the length of each coaming correct. The bottom edge of the coamings was sanded to match the camber of the deck where necessary.
I was not happy with the idea of the coaming simply being glued onto the deck so pieces of 1.5mm ply were added to the inside face of the coaming to reinforce the joints.
With the coamings completed for all three hatches, it was time to move on the making the hatches themselves. Masking tape was carefully applied round the edge of the coaming. This was covered with a piece of cling film and then four hatch edge strips (3 x 6mm) were clamped and glued into position. The masking tape provides a clearance space for the hatch rim to allow space for later painting and the cling film prevents the hatch rim from sticking to the coaming/deck. Arranging the four strips as shown makes it easy to construct a rim for the hatch which is an accurate fit.
With the four corner joints glued, the rim was carefully raised on cocktail sticks and a 3mm ply panel glued on top. The assembly was weighted down and left overnight and then hatch was removed ( very relieved to find that it wasn't glued to the deck 👍) and the plywood cover was trimmed and sanded to shape. With the cling film and masking tape removed, the hatch fits smoothly over the coaming.
The second, central hatch was constructed using the same method. For the forward hatch, I decided to vary the method slightly. The hatch edge strips were shaped to give the hatch a curved top, and left over strips of deck planking were used in place of plywood to form the top.
With the three hatches complete, it's time to move on to constructing the cabin.