Are you talking about drawings of the subjects or actual construction plans (aka 'blueprints')? There are lots of subject drawings (aka '3-views') on the 'net but less so for modeling plans. I'm working up my own for building the Star Wars B-Wing in 1/48 scale (see my thread in GenModeling - shameless plug!) so it is possible to do you own as well.
Blakeh1's suggestion about using paper model kits as templates for building in styrene is also spot-on. You can even build the paper models in (gasp!) paper... a fine example of this is in progress over on Britmodeller forum (1/24 scale Tigercat) if you're interested to see it in action. The guy started with paper, filled it with expanding foam and then cut out the various interior spots which he detailed with plastic card, brass, etc. to a very high standard. He also skinned over the paper with aluminum plate for a prototypical look. Really nice and just shows how the quality of the model is more a function of the modeler than of the materials...
R/ Robert
