Just my thoughts about it :
1) This one should probably be implemented (if you ever really code it, I mean :D) on a different "game mode". Like there's the "mission mode" and the "infinity mode". It could fit in missions (Teraform several planets seems like a really cool mission to me, even if I have to "lose" hours to start fresh on another planet. Especially if it's a different biome, discovering things I don't know yet. It's still really rewarding !
2) Now this one is really a good idea. Just because the fact that it would be possible to have access to certain things in a gameplay, and totally other things on the others. Like : Being unable to build GTR and using only "renewable" energies. Using only several Biofuel because there's not enough components to build a solar panel or something else. I don't know, just throwing that out. It seems like a really good idea, especially if it's not only the "visual" of the game that changes. Seems kinda hard to code though.
3) This one seems good if the amount of resources are perfectly managed which would be quite difficult, I think. Still a really good idea, since it adds content and visual variety wouldn't be a bad thing to a game like this where you ultimately play a lot of hours.