I took the aft top skin off to check the lines traced around the canopy frame. They needed to be redone, so I clecoed the skin back in place. I taped the front of the canopy frame to the roll bar in order to lift up the aft end of the frame. I did a better trace I marked off a line one inch from the drawn line along the center and drew it down to each end. I cut the piece out of the skin using a pneumatic nibbler, borrowed from Jeff. This will need to be enlarged. I cleaned up the edge with files and the die grinder. I cleaned up the edges of the two canopy side reinforcement pieces, F-6111.