I know it's not really an interior, but I've always felt that this underground hotel could have been a second entry point into Old Stilwater from the surface.
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I've checked on the map using a Marker, and I figure it would be connected to this building on the surface.
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Obviously it would be awesome if a custom interior could be made similar to the Old Mission that connects the hotel to the surface, but since this mod already uses warp points, I figure it would make a good shortcut to make Old Stilwater more accessible.
Edit:
I don't believe it.
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The building I picked already has an interior. That's hilarious. Maybe I can find a location inside to put the warp point.
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I guess under the stairs would make the most sense. It could be a secret passage that was planked over.