Newbie building sphere/ringworld question

[DirectorTsaarx]

Aussie: with a _series_ of refits. IOW, build a cheap base (design 1). Refit to a 50% more expensive design (design 2). Refit again to a design 50% more expensive than design 2 (design 3); continue until you can refit to a gravity plating/hyper-density cable/world generator base. Someone posted a design series once. Unfortunately for me, I think it involved mostly organic components. I prefer temporal tech, and decided the whole series refit thing was a bit "munchkin" (thanks for the new term Taqwus) anyway, so I haven't worked it out for myself. Not to mention I don't get enough time to play to make it worthwhile to work out such things...