You can pretty much count on anything that looks really cool like it's going fast just sitting on it's landing gear as a bad idea. Most war bird aircraft fit this catagory. Remember, unlike your other projects, if things get out of control you can't just cut the throttle, walk over and and pick it up. Go with the trainer style aircraft. If you want to plan for a P-51 buy a trainer that uses the same size engine and radio. That'll save you some money later if you already have most of the expensive parts.