I thought I might cover the engine mount holes with Ultracoat but I will wait and see how it flys and how everything performs first. Don't think I can cover the wing bolt holes since I will need to take the wings off to transport it. At first I thought I might make the Mad boom functional, but I felt like the weight was getting up there so I just made a non-function Mad boom tip sticking out of the hole. So far with everything I think I need to put it the aircraft, seems like it will weigh in around 9 lbs, maybe a teeny bit more.