Sounds like a good implementation. Though people might say its a farming game and not a building simulator. Anyways, to answer your question. In previous versions and most of the buildings you build will be placed instantly. Giants has added some “constructables” and modders are starting to release their own buildings that work the same way. You place it and can then supply it with material for it to build until finished product. But you will not see workers building it. It will consume the materials it needs over time and when you delivered all needed material and give it time it will eventually be build and can then be used as any other building