Also those brown square tiles on the bottom need outside corners.
they're background tiles actually, only used for parts that are inside the base. it doesn't need corners because it'd just look weird. here's an example of what i'm talking about:
as you can see here, a section appears where it goes "inside" and those brown tiles are used for that.
however, the only tiles needed are the center, left, right, top and bottom because the left, right, top and bottom are used to mark the end where it goes "outside" again, and corners wouldn't be needed for that.
