This seems really awesome. Just out of curiosity, why not take advantage of the stacking nature of containers to make the wing sheath 1xN? It seems like having a deeper sheath you could get more flexibility in wing construction just by virtue of more room. Also, to echo @roter: how does the stack below the sail container handle the extra force from the sail? Are there extra stays from the bottom of the sail container to the deck/gunwales to keep it from toppling the stack?