I generally start with a small cave or a dug out room. I then continue to dig out the area to give me more starting area. Then I use a turtle to dig out an entire chunk somewhere in the general area, usually a chunk directly next to my starting room. After that is done I start adding floors for various productions. Liquid storage gets a new chunk dug out, for the BC tank stacks, next to the production floors.
If I happen to build a building up top it is a 18x18, which eventually gets dug out below it doing the whole floor thing with different stuff on each floor.
If I happen to build a building up top it is a 18x18, which eventually gets dug out below it doing the whole floor thing with different stuff on each floor.