So, in No Tech era you've bulldozed everything in your world of choice, (allowed ones), right? Nothing there, barren ground and you have two Sims trying to survive. Let's say they make it and have an heir or two and are ready to move on to LoTech. Can you stay where you are and just add builds to your devastated world and can this be an ongoing thing from era to era until you know have a basically recreated world or must you move to another world or lot? (Obviously a builder talking here because the opportunities are terrific!)
Added: Am I right in assuming your original family and pretty much all subsequent ones up to a point, will die? So you are working with heirs, right? You said they can pick up food left on picnic tables but if everything is bulldozed doesn't that mean picnic tables will be gone? Since they can't travel where would this come from?
Seasons: can we opt for no thunderstorms, blizzards or......? Can we choose which Season we start in?