Adds modular buildings. When placing certain buildings near each other, they "combine" into a larger single entity. Can be used to reduce UPS overhead in larger bases.
This is great and I'd be curious to fiddle with the code to see if its possible to combine all pipes fluid boxes together and maybe even alternating pipes and other sorts of fluid boxes.
It's custom entities.
The script checks a table of defined allowable entities, checks for neighbors and if it's a valid neighbor, then combines the two into the custom entity.