This building in the pictures has really wrong placement of material storing tables to rebuild it. First of all it should be considered as 2 different houses because you have to go outside from one to go to the other they are not connected internally. If you want to build in the left side (pic 2) you have to go in the house on the right (pic3) and you have to go to the left side to place materials to rebuild the second floor of the right house. It makes no sense at all.

You can have all sorts of problems if you decide to build in one of them and you have to go outside your base to be able to place materials to upgrade yours or someone can build and block the other side and don't have access to your own base worktable.

It should be considered as 2 different houses and have an extra worktable on the second floor of the right house for it's upgrades and the house on the left side has the same worktable but only work for its two entrances and nothing about the other house.