First of all thanks for the suggestion @SirStafford. There has not been many official references to the 3 kingdoms, we know that the hearthlings of each kingdom will have different names. (The community has given a lot of these names to Tom on the stream.) Team R has also said on numerous occasions that they didn’t want a substantial difference between the three kingdoms.
I’m going to quote someone who quoted radiant (not the strongest source, but I have no reason to doubt @virtualFudge
I’m not sure if building qualities are included in this. I have a feeling that the building mechanics will be nearly comparable. I say this for several reasons, 1. the team would have to rework the entire building menu 2. as I said above, they don’t want drastic differences between different kingdoms. 3. in the long run it will always come down to the players choice (especially with the slab option)
So although I agree, it would be cool with the varieties your mentioning, I doubt it will actually ever make it into the game.