Chuck. I think your right about all that stuff. I over simplified my answer to point out that the physical dimensions and attach point locations are the same. I have a set of the model 4 flaperon control and wing mod. plans from Skystar
and in them they sure hinted that after installation your plane would be considered a 1200. About the gauge and wall thickness of the various components all my info is anecdotal gleaned from this forum and talking to people. To the best of my knowledge nothing definitive has ever been published on the subject.
Dutch