From the website it said that the plumbing is on the INSIDE of the house within a core which appears not to come. So it looks like they have a smaller "inner core" circle an an outer one. don't think u can build that here in IN with all the COLD.
I dig it!
But I think living in the old Jail in Crawfordsville would be more cool.
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-J-
Maybe the plumbing is part of the inner core that doesn't rotate.