Walking inside a space ship while it is moving at high speeds

I’m making a game that allows you to walk inside a space ship, consisting of 8 decks, and will use simple panning to simulate outside movement in space from its windows since the ground simulators will be on the planets., I could make it also a space sim but
don’t know how to create the nebulas yet for the ship to fly though. i’m not sure where to start on this either in Unreal Engine 4
with blueprints because ofthe lack of geometry tools and resources and the limits the blueprints has…I can only do Basic shapes with these tools. And I need to know how to build the decks of the ship. But If I use Third Person Character for building all my 3d worlds then I will get the 3d world look, but I may have the issue of the game using up too many 3d resources for building the whole world.

As for the question there’s two options I can think of. That you can use a tile map system to cut down all the drag if you don’t have a powerful enough machine or enough ram, or do it as a 3d world using modular sets to build the ship interiors.

I don’t like the fact that there’s no auto rigger yet in Unreal Engine to save time in rigging all the models.