I'll let John answer about the helicopters, but the latest "official" word about Star Wars models is that George Lucas will allow all types of fan art, including 3D models, real world models, fan films, fan drawings, paintings, animations, etc, on the condition that no profit is made in any stage of the process, and that it fits with the general "ambience" of Star Wars, in other words, if you make a pornographic Star Wars they will come after you, but everything else is cool by Mr Lucas. Apparently he has a large collection of fan art and films people has sent him, and he loves it. This does obviously not extend to everything Star Wars, as some things come from games and books that George Lucas doesn't own the copyright on, but in general you are safe with Star Wars products.

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