Build.lua is created, which allows you to use earlier-declared blocks to make units!

build.placeBlock(x,y,z,block)  --place block
build.read(x,y,z)  --what block is it? (usually used as build.read(x,y,z).formula, as oddly, without .formula it returns nil...)
unit,unitBlocks = build.make()   --make it a unit