RE: Giant Scale P-51 Plans??
Don Smith from Precision Cut Kits has a 112" wingspan P-51D. Its very scale, I'm actually thinking of building one myself. I got the plans, and Laser Lizard can cut you a short kit for $220.00. I know someone who has a Quadra 100 and a 26x12 prop on theres at 50 pounds, flies very nice. The inline has had some problems with overheating in the past, because the P-51 cowl is somewhat small.
Another option is enlarging Ziroli or Dave Platt plans? Lots more work though.