Dan... I apologize for the little hi-jack up there ^^
I live in a house built in the mid 20's..in 1920's
The first two pictures you posted could be in my house...
Is that daylight I see in pic one?
One thing to consider since you say you will stay in the house during construction... you need to go up!! dormer etc.... if you pull out and change the elevation of a floor... the house will be unlivable for a period