Something like Supreme Commander's templates?
Well that's interesting. Yes, "templates" like that would help, and I wouldn't turn them down. Still, they're most useful when there's plenty of available space. But most of the time in Mindustry, I have to customize my ideal layout of structure, to fit cramped spaces. That's particularly true at the front lines, and that is where the structures often end up being destroyed. What I had in mind was more like: draw a box around the destroyed structures, and they get re-queued for construction.