The keel was originally made by laying these heavy steel plates in a female mold and pouring in resin. I measured the outline, and found the trailing edge went out by about two inches, so I cut and ground a piece of 1/4 x 2 mild steel to match the profile and welded it into place. This will serve as the base to support the new keel surface.

One of the not-so-obvious problems is illustrated here... how do you hold the keel up to work on the edge? I had to weld up a large "fork" to move the keel around. You can't see it in this photo, but it's holding it upright. If this large, heavy thing would happen to fall, very serious damage could result, as in amputated fingers or hands, or crushed leg bones. Be extremely careful if you do something like this.