I assume you are talking about that when talking to the steward you have the standard decorations shown like this: Alchemy (500 Gold).
The custom decoratios whatsoever are displayed like this: Basemant ( Gold)

In your tutorial you are not mentioning this issue - also in the video you never change the Global in the topic text from alchemy to basemant.
Have you found a proper solution for this issue? (Of course I know that I just could fill in the numerical value instead of the variable - but I would like to make it like its made in vanilla)

Is there an update as to how the progress of the purchasble custom house mod tutorial is going, or if it is still in the works? I desperately want to do this as a money sink in game but can't figure it out myself