I'm learning a lot more than I asked for in this thread and really pleased to read some techniques about tube bending! Back to my project for a moment... would you have a suggestion on how to orient the reference planes (datums) as I begin to build my model of the fuselage? Logically one plane will bisect the fuselage top to bottom, essentially the projection of the vertical centerline of the airframe. So considering the other two planes, maybe the other vertical plane should be establish by the mounting points of the engine mounts? What about the horizontal plane - this has me a bit stumped. Not sure what makes sense. Certainly others (probably you guys) have faced this same dilemma and hopefully have come up with a well thought out conclusion. My thanks again!!!