Good point. I would make up a bill of materials and keep tract of the hours to build at a rate of X dollars per hour with a ton of pitchers of the build. You are right to assume some Leo would smash your plane. Back years ago there was some one flying a C/L plane at a school yard in Riverside Ca. when you still could. A police car came rolling up and the officer got out came over, sad there was a noise complaint. The officer told the pilot to land the plane. He yelled and said he couldn't. She did not buy it and ( Yes it did happen, but she didn't ) She pulled out her side arm and yelled to land the plane or she would shoot it down. His friend was trying to explain that it had to run out of fuel which it shortly did so. She got 6 months desk duty for acting like a jerk. Now a days I would not put it past a Leo to walk out into the circle and yank that handle out of one s hands.