Vadim135 nuked my base, so I reloaded from about 20 minutes earlier

Yes, very similar idea.

TL;DR
Be able to make custom factories.

What ?
Like a blueprint but it fits into a single factory block and is scaled by its size.
It's actually a seperate map because it's located inside a factory, you define its size 10x10, 15x20, whatever you need
Then you build a factory layout using the ...