Once I knew space could be made to hold everything. I jumped ahead to the most difficult part of the project - building a gas-tight hatch closure. I wanted to do this first because if it proved not doable then I would go back to plan B which was to use smaller propane bottles and a smaller off-the-shelf sealed hatch, like the newer 22s have.I designed the locker lids on a CAD system. Each lid (port and starboard) was built as three separate components. The lid top and the o-ring channelwere then epoxied together. The lid base will be fiberglassed into the top of the hatch and the top will be secured with hinges and latches.