I'm not sure how far you're going.... I am doing a kitchen remodeling in a 100 year old home. They say that beauty is only skin deep but ugly goes clean to the bone... While this was meant to consider the depth of human beauty, It can also be true of this kind of work. When I peeled the lath and plaster off the walls to erect hanging boards for the new cabinets, I found three old squirrel nests, and structural bug damage that might have never been discovered til something fell in. However, it gave me the opportunity to do a complete rewiring (I'll never have to worry about the safety or adequacy of old wiring), I got to insulate the walls properly with a vapor barrier, but most importantly, I was able to add fire-blocks to the balloon framed room. Previously animals could get from the crawl space to the second floor, as could fire... but no more!