The campaign sounds great. You mentioned smooth transitions, so here's a thought...
First a little background, I love sims type games and I would love to see mods that added some house building and decorating into this game. Obviously building a house is not a sensible thing to do if you're trying to GET THE HELL OFF THIS PLANET, but some shelter from storms and a dark place to sleep couldn't hurt, so..
...why not have the player build himself a newer or more advanced little house as each part of the campaign? That way you have a very specific starting point or point of reference for the player, that can help with the orientation. "This is the old part, where my house of wood was, I just abandoned my house of steel and have now near the end of the whole campaign I moved into my fully upgraded scifi house to keep me safe during the night.
Anyway just a thought, if not for the devs then maybe for the modders out there
