The old forehatch was getting a bit passed its useful life and was in need of renewing and it was no longer fit for purpose. So it was removed which took some work as it was well fixed to the deck. However, it did in the end part with the deck.
The four pieces of the lower part of the forehatch were temporary fixed together to make up the shape which is going to be used as a jig to build the new forehatch so that the inside measurement can be used again, although the outside measurements are going to be different as the forehatch upstands are going to be thicker than before, so a lip can be made up to stop the water from coming through the joint in the hatch when it is closed.
The design of the upstands for the forehatch so that the water can not pass through the joint when the forehatch is closed while at sea in rough weather and water coming over the fore deck.