Creative Auto Builder Mod

The idea I have is perhaps to select an area that you've already built, copy it, and then when you use a command or whatever, it would build it using materials you have in your inventory(if you're in survival) or if you're in creative, it would just build it.
Preferably make it so it works on Multiplayer and across servers and single player worlds, not only to a specific world or server.

have a select thing like this maybe (doesnt have to be visible, it can be like Worldedit and be invisible.
And then just have copy/paste buttons added to the esc menu or to a liteloader menu or something like that, so that moving around complicated structures like redstone, houses, etc, can be easier.