Short version:
Make custom map in creative.
Save it.
Load it in career mode.
Have fun.
Long version:
My idea stems from how detailed you can make maps in creative mode. I love how you can build your own custom galaxy exactly how you like it.
Currently the only way to play the map you made is on the creative save file, and if you wan to play it again you have to load that save.
It would be sick if you could load the map in creative/survival mode. (Similar to adventure mode in Minecraft)
Idk, basically custom maps. I’ve seen similar suggestions but I think this is different enough to justify its own thread.