Does somebody know of a blueprint that works like the bunker placement system in Fallout Shelter?
You mean placing the various rooms next to one another? You could snap meshes together with grid snap. You could use sockets.
I’d make the whole grid first and fill it with dummy meshes, swap the soil mesh with the room mesh when building something. Smoke & mirrors as per usual 
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Yes, I thought of a similar solution. But I’d like to see someone else’s work if they’ve done it.