An import/export system of creations would certainly be useful. You can then easily move your base, or create it in a more convenient location before putting it in place. With some additional changes it could also allow to make small creations or parts of a larger structure, to be added to an existing base. Maybe a shop at the Nexus where creations are shared with others? Would be a nice way to spend some Units.
When I first started playing NMS just prior to Atlas Rises, I actually thought that was what the Steam Workshop did. This was however not quite the case, although close. I had hopes they would expand on it, but instead they decided to abandon it completely with NEXT.
Either way, on PC with a save editor, it isn’t all that hard to share the JSON data for a base. Shouldn’t be too hard to create a tool which calculates the cost of parts either. Maybe have some mods work together to make this possible?