I hollowed out the foam from under the V berth. I entered froml the side first, and found that it was almost impossible to work in there, so I then entered from the top. Glad I did both. Used Tempress hatches. The first set were "slam" catchs, and due to the very slight curved of the wall, they would not stay closed. So they ended up on top, and "cam" latches on the vertical sides.