Since I've never played with Minecraft, I've wondered, once you built a structure, can you copy and paste it as a whole? Can you reposition it as a single unit?
Not with unmodded Minecraft, though I know you can with MC Edit (if the tool's still around, I think the original dude behind it stopped updating, though I'd be surprised if someone else didn't take over) and I -think- other mods like VoxelSniper have that capability.