3D FROM THE FRONT TOO
So with the tanks in place and the side decks fixed temporarily, the dear things are looking like a pair of boats (or tea chests depending on your point of view).
We have a longer front buoyancy chamber than appears common, and our masts will mount through the deck. This will compromise the watertight nature of the tank a little, but we have plenty in reserve, and will devise a simple gasket arrangement.