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I apologize for not getting back with an answer on the Corsair photo, Chris.
From the looks of it the wing should be fairly easy to build a mold of. I'm still scratching my head on which edge to put the pour stubs, however. The stabilizers shouldn't pose a huge problem, nor should the main gear wells/doors, and you've seen the prop method I've used with some success. The cowling could be done with a one-piece mold as could the engine.
Casting the main and tail gear assemblies is going to be somewhat difficult without a vacuum chamber to eliminate air bubbles, and they're going to be pretty fragile rendered in resin. Perhaps a wire gear leg/spindle with the resin jury struts added to it would be more feasible.
A question--is the fuselage molded in one piece? If so, it will actually make the mold easier to construct but be a little bit more difficult to pour resin into.
The canopy should be a vacuform part. I have no experience in casting clear parts in resin, though I've seen that it can be done. The clarity would not really be what you'd want unless there are some new clear resin products I don't know about.
The jeep should be do-able. Someone made a mold to cast it in white-metal and the basics are pretty similar.
A couple of items to mention--all the paint and decals really should be stripped from all of the parts to clean up the original detail--the RTV will EXACTLY replicate any irregularities. I'd also mention that when planning a two-piece mold it is always helpful to use any original mold lines on the master as a guide to making your mold. If it worked when producing a styrene part it'll work for our purposes in most cases.
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