Here's my problem. We live in a house that was built by cavemen. No corner is square, the window holes looked like they were chopped out with an axe. The bathroom was originally built 5'1" wide stud to stud. No wall is even. The 5' tub/shower unit is fastened directly to the studs. One wall was built up with plywood then greenboard. The problem is as you look at the tub, on the left hand side, at the top of the surround, you can see where the wall bows out. I'm afraid that when painted this will really show up. We have thought about sanding this down and trying to remud or putting up a PVC type panel. I really don't think I want to tile that area. It is 22" from the top of the surround to the ceiling. Any ideas would be greatly appreciated at this point. I would like to have the upstairs bath back. Taking 2 small children to the basement shower is getting very old.