Today I had to cut out the aileron / flap covers. Not too hard just really time consuming to get them perfect. While I was at cutting light ply by hand I cut out the elevator / stabilizer covers and the spar covers too. I just really took my time and I used a piece of aluminum that was 1/4" X 2" X 44" long (straight stock) that I bought at a typical hardware store. It is really good for drawing long straight lines and has the weight so it doesn't move around much when you put side pressure on it while cutting with the Xacto knife. I thought about cutting this stuff with my bandsaw but it wouldn't have been as straight an accurate so I just did it the old fashoned way - elbow grease and the patience of an oyster!!!! LOL. I got them all finished and they fit like a glove. Whoo hoo!