If you notice, I did NOT say SolidWorks 3D, I said a 3D read only eDrawing or 3D PDF copy of the model. You can set up those copies without measurement ability, so no one can copy it. The idea is to be able to identify the parts easily. Whenever I see a plan, it takes me "forever" to see which part is which and how all the things go together. Particularly when a complex airplane comes with a 20 page (only) documentation. Somewhere earlier you said, it will take a few hundred hours to put it together. THAT is the key. Some builders have money, some don't, but NOBODY has time anymore. So whatever help you can give to speed up construction will be appreciated. A 3D model is just one of those item. (An accurate Bill of Material is another, a material kit is another, full size templates another, step-by-step pictorial instruction and videos are another, set-up a Yahoo group is another).Who supervises that no copies are being taken from the sent copies or is this like gentleman to gentleman business ?
(And I would prefer the high MPG/small engine 100mph cruise version if I would be on the market for one.)