Hello ... the rear of the 30" wide bathtub in my new home is 1/2" off level, sloping out towards the bathroom floor (the front is 3/8" off level). Should I have the builder fix it (remove the cultured marble, drywall, toilet to get access to the tub, etc.) which will be a lot of mess and time or just install a tub enclosure ? Any opinions are appreciated. Thanks.