Best Way to "Animal Proof" An Unfinished Room

My garage has a small unfinished storage room (drywall isn't painted and floor is exposed cement slab). What I'd like to do is convert this into a room for our 2 cats' litter boxes.

Could use some recommendations for the best way to animal-proof this room - specifically the best way to odor/stain proof the room and also have it be easy to clean.

For the walls, obviously I'll prime the drywall, but what's a good type of paint to "seal" everything? As for the floor, I'm not sure what to do. I'd like to get something that's cheap & easy to install but would also hold up well against any little "accidents" the cats might have.

Couple pictures below...I'm also going to put in a light so the little fellas can see in there.

 

I would suggest blocking off the "vee" section by installing a wall at about the point of the first vertical seam tape. Ideally, painting with a high solids rubbery or epoxy paint would be more than enough but probably any latex paint with at least three coats would be sufficient. For light, just install a receptacle high up and use a little LED night light, it will supply more than enough light for the cats. Even lit 24/7 it will use a tiny amount of power and likely last ten years.

 

I'd prime the walls and apply 1-2 coats of latex enamel. Epoxy or even oil base enamel would seal the drywall better but might be over kill.

 

If placing the litter boxes near a wall I'd even think of putting up a protective panel on the wall. Most home centers carry fiber reinforced plastic sheets. It comes in sheets 4' x 8' and is usually white with a pebbled texture. It is often used to cover walls in commercial restrooms and tub & shower surrounds in residences. Just cut to fit your wall and glue the panels up and you have a water (cat pee) proof plastic wall covering that's easy to wipe and wash down.