RE: Pictures to DesignCAD
Are we talking 3 view jpgs or actual pictures of real aircraft taken out at some field? If it's pictures then you can't just import them or if you do you need to trace them using a 3D program with the axis' skewed to match the perspective of the picture. By filling in and editing elements to match mutiple views you should be able to place the elements in space where they should be. But I'm only guess ing on this since my 3D CAD skills are about .000001%.
I believe there are photo analysis programs available for doing this but they are very specialized and probably have prices to match.