also, I'm told after Tenants move out with Cats to do all the Remediation work, Remove all Carpets put down new flooring, repair and clean all surfaces including air ducts for heating and air. to call an Indoor Air quality inspector and get units certified as Allergen free.

We are talking about cleaning a fired glaze surface.

Overall the house has great bones but it will take a few grand to complete the punch list of items needed to remedy: radon mitigation, surface mold in attic, slight leaks at a few easily accessible spots in the roof, electrical service work.

A base cabinet to the right of the stove, not so much for a buffer but so you have surface area to put utensils and such on.

On the surface it may look like all you have to do is put up walls because there is probably already a roof but what you are thinking can require work not only to tear down the existing but rebuilding all the way from the foundation and including at least one wall typically from the living room, not a good idea.

You are going to want it cleaned and filters changed in order to help get rid of the smoke smell.You are going to want to wash every surface that you can get your hands on -- walls, windows, fixtures, painting may be easier depending on how bad it was.

Typically one coat of good primer and one coat of paint will be fine for most regular lighter surfaces. 

It would only be surface dressing to all your follow up questions. 

. $150k sounds terrific on the surface, but it took you 4 years to get there.

Use threaded nipples for shutoffs so they can easily be replaced down the road.Use hard waterproof surfaces whenever possible.