You can find the Experimental Z level setting in the world options, which would allow you to go up and down levels and attack from above, but you need a staircase and a multi-level building, which is pretty rare seeing as the Z levels option isn’t anywhere near complete yet.
Mains power isn’t a thing, and it would realistically take a lot more than one person to fix it and keep it running, but you can use the vehicle construction system to achieve most of the same things. You can’t power the existing ovens, but you can find or make an RV Kitchen Unit, find a minifridge, hook up a few solar panels and have a fully functioning kitchen setup. Take a look at this to see a good example of the vehicle system being used to give power to a home. 
