After a couple months of development there is a sci-fi environment in the DLNK store for Unity.
This pack includes a lot of modular & customizable prefabs for building your own space base. It's designed to work in space and also as colonial base in outer planets. It includes several rooms and corridors wich can be divided with doors. Also the material can be customized for each part of the asset. You can use the included or your own custom ones. It doesn't require lighting since everything is illuminated with textures. Its suitable for exteriors, interiors and also Top/Down games.
Finally decorate the environment with the props included or mixed with other assets and you'll have your space scene ready!