My bathroom is in desperate need of a remodel around the tub area. There was tile installed almost over a decade ago and there are areas where it's sunken in from the drywall needing replacing. There's also a window with a wooden sill inside the shower. My plan is to remove the tile and replace the drywall (or whatever's under there) with waterproof sheetrock (or whatever the stuff is called.) My problem is with the window. It has to stay where it is for ventilation and I won't have enough to replace it with a smaller one. The wooden sill looks like it needs replaced, though. We have a shower so it constantly gets wet. I've no clue what material to use to replace it, though. What I'd like to do is get one of those one piece wall covers that match with the tub and cut out a spot for the window. I don't know if that can be done though. Does anyone have any ideas what I can do with this window other than wall over it?