The doors might be an issue but you wouldn't know until you bought the house and opened it up. My house was built in 1960 and I've opened up the walls for electrical on a few doors. Just be prepared in case it turn out to be $300-500 in labor per door.
On the pool expect to pay $1,200-2,000 a year if you do it yourself. Double that if you plan to hire someone to do it. -- IF YOU FIND ANY MISTAKES IN MY WORK...Please consider that they are there for a purpose. I try to please everyone and there is always someone looking for mistakes!