It was cobbled together at its inception and during any and all subsequent repairs or alterations. Trying to sound professionally technical about it would almost make one sound like a boob. There's no perimeter foundation. I would bet my teeth there's termite or pest damage in areas I can't see or get to. The entire structure has settled and will continue to do so. No effective repair can be made without lifting up the house to put a foundation under it whereupon you'll find a multitude of other problems. At that point, one must consider the entire package and decide if it's even worth it. Lord knows what mess of problems are in the electro-mechanical systems. If there's historical value in some form, conservation is noble and possibly warranted. If there's no historical or cultural value, it's a fool's dream house. The most effective approach is probably living with it and understanding it's a marginally functional piece of crap. I look at a lot of 110+ year old pieces of crap that hold up fine. If someone doesn't care about mice, cold floors, all the other stuff one gets with a piece of crap, and the price is right, then maybe it's ok for the individual that wants it.