I have built two of the p-40s for warbird racing and have found a couple of problems with them. The CG is too far back,The landing gear is fragile. The mounting blocks need to be reinforced using either landing gear. They only go between 2 ribs and the way the non-retract gear wire goes is back toward the trailing edge. It is best to make these changes before trying to fly it and tearing out the landing gear.The cowl mounting system needs some reinforcing blocks to properly mount the cowl. The covering does look great but makes it difficult to match repairs.