A normal Nauvis start, but every other planet is replaced with asteroid belts, so space platforms are still required. Go asteroid mining for Tungsten, Scrap, Lithium and Pentapods to progress through the usual Space Age tech tree. Now configurable. Bugs expected.
Mods introducing new content into the game.
This is a hack on top of wonderful https://mods.factorio.com/mod/onlyNauvis mod which adds settings as to which planets to remove.
Want vulcanus to be an asteroid belt but everything else to be available as per vanilla? Sure you can.
Same with gleba, fulgora, aquilo.
currently testing, but seems to be working OK.