[MetroMPG]

That will temporarily conclude my pondering the "crooked issues."

I'm going to focus my attention on the bedroom at the west side/rear of the house. The addition containing this bedroom and the bathroom is level and plumb, set on solid footings directly on bedrock (which is literally just under the grass on that side of the lot).

My rationale for starting here has 2 parts:

1) It's straight & level (easier to deal with).

2) Also, starting with that room means I can then move in because I'll have somewhere nice & clean to sleep and work (I'm self-employed, work on the computer). From there I can branch out to tackle the other parts of the house.

I've already started gutting the bedroom. Water damaged ceiling & old insulation is down, opening up the walls is next on the list.

I have it in my mind that I will double the wall cavity thickness - half of the additional width inside, half outside) to add insulation. (However, I will then likely nullify the increased R-value by installing big windows!)