Today, I did a lot of work on the pedal access hatch. First, I marked the access cover for 20 holes, then clamped the plate and attachment ring together. Then I drilled, clecoed and deburred all 20 holes. These will eventually be drilled-out and dimpled for #8 flush screws. Next, I decided to check the clearance of the plate and its attachment ring, since it will be very near the NACA air scoop and various fuselage longerons. I taped the NACA scoop in place, then taped on the access plate and ring. I found that I had to trim the edge of the ring in two places. I filed a shallow notch around the bottom of the air scoop, and trimmed a bit off the forward bottom edge of the ring. Next, I marked and center-punched the attachment ring for the 46 rivets that will attach it to the fuselage skin, then cut out the interior hole of the ring, and filed and sanded the edges. I taped the ring into the fuselage and drilled/clecoed the #40 holes through the ring and fuselage skin. Next, I deburred the ring and skin, then taped the ring onto the outside of the skin and marked the location of the future screw holes onto the skin. Then I removed the ring and taped the cover plate on the skin, using the small hole marks as a guide. Finally, I traced the edge of the cover plate onto the skin. I'll cut the large hole in the skin next time.