The capper, so to speak,  was to spray every square inch of the interior with two coats of Zinger BIN Shellac using an airless sprayer.

So I wouldn't recommend people with animals.

Some will have been lived in by well or poorly managed animals and some by people who live like animals. 

Drywall everything above that with a no mold ,water resistant sheetrock and paint it with a couple good coats or three of good enamel paint to keep moisture away.Best part of a demo to the studs is you can replace wiring,drain plumbing ect as well as upgrade to a modern light/vent that is ducted all the way outside and insulated to prevent condense inside.

Put an attractive top coat of paint of the walls and ceiling.

If the cabinet bottoms are still ratty, either cover with a stick-on vinyl or a coat of quality latex enamel once clean and dry.

The one on the left enters directly into the dining room, while the one on the right enters into the living room with a coat closet right there upon entering.  

Porch all fixed up and exterior paint complete plus roof coated, primed and painted. 

Dead animal in the walls or the duct work system??

Originally posted by @Monique Rene Coates:@Johanna Serna.