I realy like the system that's in place at this time but it gives a like wonky and not permanent vibe (I'm talking about myself).
I suggest like a more permanent looking base (hallways, domes, rooms, etc.) that you can attach to the exo habitiat. It would be more for mid to late game so you would still have to use the platfoms at early game (also maby make a repacker or something so you can put them back in the boxes for easy transport).
I don't suggest taking away the modularity but it would have this more permanent and styalized look on it and would give the player an advantage (less power used, les time taken for modules to word, etc.) when he/she/it would have reached this point.
I hope this idea maby could catch the eye and be considerd by the awesome team of system era.
(sorry for bad spelling, I'm from the Netherlands)