When I was a high school, I had a friend who lived in a very similar house, sans siding mania. My friends and I were there to pick up our friend, but we ended up going inside for like 10min. The house was super long and just had so many room and doors. Didn't get the grand tour or anything. As far as I knew, there were only like 5 or 6 in their family: 2 parents and 3 or 4 kids. But I think other family members lived there, too. It'd be too big for one family, and there was enough stuff that made it look like relatives lived there as well.
I remember thinking, "How do you not get lost in here?" And, "Was this always a house, or was it like a converted apartment or boarding house, like for assisted living?" I never asked because I didn't want to embarrass my friend. The rest of us lived in SFHs or duplexes. Didn't want to put them on the spot or anything.
So much weirdness. The box fans inserted into the walls. On Pic 38, the shower faucets are outside of the shower itself. All the ceiling fans. The "conference room" or perhaps church space. In Pic 28, using the carpet as "wallpaper," and similarly in 29, the carpet for the top surface of the half wall. Using PVC pipes as handrails on stairs or in the closets and hanger bars. And it looks like the vehicle in the garage might actually be a hearse!
Good find!