I just went back and looked at "Hood's" pictures--appears he is using torx, but I still agree square would be better.
BTW, I just noticed also that he put the steel strips on his keel before stitching the hull, etc. That means the fiberglass will go over them--so I don't know how they will give him any protection from water infiltration if he ever rubs through to the steel. I just hope he has nice sandy-beaches where he sails.