I just import the outlines such as wing/fuselage etc as paths and set them as vector masks for groups and then bring in the panel lines as shape layers, stroke the paths. Rivets and markings are brought in as smart objects, I've found that not only do I have the plans in Illustrator but it really does speed up the work flow, loading selections of paths helps as well.
Everyone has different methods of working though which they swear is best.![]()