Leroy - Beautiful work! It's funny that the paint on your Mustang is much higher quality (chemically) than anything they even had in WWII.
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I have a Top Flite Control Line P-51 kit I plan to convert to RC. I built one when I was a kid. Well, I'm being generous. I trashed the kit as it was way beyond my capabilities. I just have to look at the plan and make sure that the wing isn't asymmetrical as is common in control line kits. It has a 35 or 36" span and was designed for a .35. I think it will fly very well with a .21 considering it doesn't have 60' lines to drag around.