I expanded my victorian house,by using the same number of walls
I used the interior wall for exterior,while one part remained empty,so I covered with a strong carton!For baseplate of the patio I used also a carton from a box!Some tiles of the attic,cannot be attached well,because of the patio!
Well,this was only in order to try something different,and I'm thinking of buying spare parts of 5300 and 5305 from ebay!