I am building a 12 1/2 foot Catspaw dinghy. This is my first boat-building project and I screwed up cutting out the centerboard slot. The boat is all planked up and fastened. The slot is cut into the 1 3/8" thick red oak keel. The first 6 inches of cut did not cut square to the top of the keel. The cut slops to bottom, outside of the keel. The slot is fine on the top ,inside of the boat. However, the bottom of the slot is 3/16" to the outside bottom of the keel. The plans call for the centerboard case to be fastened to the keel with 2 1/2 inch #12 screws. When I draw a full size picture of this mess, I barely have enough room to the place the screw through keel and into the center of the side of the centerboard case.
I would appreciate any ideas on what I can do to fix this problem. I am considering gluing a piece of wood back on the slot and re-cutting it. I have also thought of squaring off the slot with epoxy. However, I am concerned that the epoxy will not hold well to the red oak keel in this application.