I am installing a fiberglass shower enclosure. My enclosure has a nailing flange that is 3/16th of an inch. I want to run drywall up to the shower, but to do this right I will have to furr out the entire wall to compensate for the thickness of the flange. Do any of you guys have a simpler solution or is this my only solution? Can I stop short of the flange with my drywall and use thinner drywall to fill the space?