I wanted to know if it was possible to have a larger moghouse not the storage part of it but a bigger floor or even a stair case that goes up behind the fireplace/waterfall/stove to a second floor?

I'm on of the people who has 80/80 safe for furnishing alone as much as i would love to see furnishing get their own storage (via special furnishing storage) i would love to have a second room to decorate or even a quest to make it a full size single level house with multiple rooms.