GOOD ADVICE GUS! Changing one thing at a time teaches you more about what you did, rather than trying to figure out what did what with several changes at once. FORESTROKE...You bring up a good point about starting over. A favorite project of mine when I was a kit builder was to order my own contest grade wood, and build a better version of a plane that I was already flying. An easy way to make templates is to photo copy and laminate the plans, then cut the laminated patterns out. I have used 2 layers of clear cellophane package tape for the laminate. There are so many outstanding .45s on the market that your decision to go back in size will pay off. MORRIS HOBBIES has a good deal on a ROSSI 45 with a mini tuned pipe. The Webra 50 was rated as the 3rd best power to weight engine in a survey that was done by one of the US model magazines. This engine will turn a 12-5 prop good enough to haul 7 pounds straight up. I think this engine would be hard to beat. There are others, like YS that also have great reputations, but I have no experience with, so a trip to the engine forum would be a good way to do some research on what's the latest and greatest in the 45-50 size range. Good Luck, and have fun. You have an interesting project on your hands!