Further examination of the wooden base points to this being homemade. If you look closely at the photos (I saved them to my computer and then zoomed in on them), you will note that the wooden base is not made of 2 pieces, but rather there are 2 levels to the base, with the top level, which is made out of a single piece of wood, being solely related to the platform. However, the lower part of the base is made out of 4 different pieces of wood. There are 2 different pieces of wood under the building with a smaller piece on the side without the chimney (note the joint under the building, which can be seen under the platform in the corresponding place) and then separate pieces of wood that are only under the platform on each side of the building (again look for the joints).
If this was truly a mass produced item, there would simply be 1 or 2 pieces of wood, not 4 pieces comprising the lower level and then one piece on the top level tying them together and there certainly would not be 2 different pieces of wood under the building.