The notches for the keel and the bottom battens have been cut into frame #5. After some experimenting with the router, I decided to cut the notches by hand. Two quick cuts with the panel saw, and cleaning up the notches with chisels and sand paper, took only a few minutes each. I have also cut a couple of large holes on both sides of the frame. These will come in handy for electrics, steering / throttle cables, and the like. The top holes will be completely hidden under the deck and behind the coaming. Similar holes will be in frames #3, #4 and #6.