Suggestion: Allow rebuilding of destroyed structures, without manually re-placing them.
When I come up with a good build, I don't necessarily remember how it all worked. It's okay that having stuff destroyed is a setback, but losing my build is too severe. Usually, it just means quitting a game that would have been salvageable, if not for the bad experience of losing my construction plan. I mean, you'd think an AI would remember to save and back-up.