Covenant - Clean the cabinet boxes well to remove any grease and fill any holes or voids. Lightly sand all the surfaces to be covered with veneer. I cover all face frames and boxes with a thin wood veneer. Any larger end panels should be covered with 1/4" veneered panels. The face frame veneer will overlap the edge of the plywood. If done correctly, all the corners will look like mitered solid wood. Of course, if you want to paint the cabinets you don't need the veneer. Just prime and paint the face frames and sides and replace the doors. The insides of the cabinets will not change unless you want to paint them to match the outside. Hope this helps.