I wondered why they didn't change the interior to match the outside at the VERY least or let us buy something to apply to the inside to change it ourselves. My fc uses the forge or blacksmith (I forget what it's called) exterior. So for the inside to be sandstone due to being in the Goblet and the outside is wood and metal.. its always seemed a bit funny to me.

But hey.. I remember when houses were locked to their zones/areas too as far as exterior. So maybe it is a work in progress feature.