TheAnimeHunter
First time out of the vault
I have never delved deep (enough) into the engine to make a custom terminal, but it always seem to me that the overland map could be a world space of its own, with an overhead camera looking down on a terrain model, not unlike what appears in Skyrim.
Honestly? I might have an idea when it comes to putting Fallout 1/2 styled travel in a 3d fallout game, but to be absolutely honest with you it might sound overly ambitious. I'll have to work on it for a bit before I can properly explain it though.