Measured, trimmed, fit, trimmed, fit, trimmed, fit, sanded and fit again the left door. I copied the process used by many builders before me. the homemade edge finding tool worked very well and took a lot of guess work out of the trimming. The door is now fitting snug inside the fuselage. Obviously, there will be much more fiberglass work in the future but for now I can move on to attaching the hinges.