Thanks for the comments, guys! I do think maybe there's a misconception. though. The foamcore version is just a mock-up for reference. The hard copy will be scratchbuilt, not cast from the foam; and I'll be able to get nearly all of the acrylic for free, since my father owns the local lumber yard, and is always loaded with scraps. Still, it will be expensive, but it'll literally take years to finish this, so it should be fairly spread out on costs.
Here's what I've got so far on a Millenium Falcon correctly scaled to the 3 3/4" figures. First I did a foamcore prototype to nail down dimensions and locations: I'm now beginning on the final plastic version using acrylic and styrene, with lighting also to be incorporated. Comments/critiques welcome!
The foamcore prototype:
Early stages of final rear landing gear and cockpit, with a few detail pieces beginning to be added: