I wonder how the scripts work in Heartnfire. There, with the creation of the foundation is not added to the inventory, and is based on the locality of. I was trying to figure out the scripts, but I did not succeed, because all scripts related to each other. Prompt how they work, or write to me all of the scripts in a single file and I'll try to find out.

Things related with HF usually start with BYOH prefix. You should start research from BYOHHouseBuilding(Quest)

Usually things are enabled from script, not necessarily the directly the object you'll end up seeing itself but a reference that enables other linked ones. When creating something from workbenches usually an item is added in player inventory which triggers the enable of building parts from an OnItemAdded event on a player alias (look for player aliases on BYOH quests)