about that 20-40 minutes thing..

you DO know that a regular game usually runs at around 60 frames per second in order to look nice? other games run at lower speeds, but anything under 20 frames per second looks impossibly fast.  and i know, you said that this is going to be a movie, but games and movies are similar when it comes to graphical requirements.

now, 20-40 minutes at 60 seconds apiece is 1200-2400 seconds, and at, lets say 30 frames per second, comes out to 36000-72000 frames. frames as in INDIVIDUAL RENDERS.

so unless you want to spend a LOT of time rendering stuff that you might not use, id suggest rethinking about what you are going to do here

as for detailed models, just look around and youll find something. just about everyone else here has had to look for things by themselves. either way, good luck. youll need it