Have you ever thought of just going to a shower curtain? We had a small shower in a tight bathroom and dumped the door and went with a nice fabric on the outside and a clear vinly on the inside. Or get the fabric they use in hotels. You end up with more room, less cleaning and you can replace the vinly curtain when needed. You will have to fill some holes from the old shower and clean the caulking off, but that is not that hard. We had the fabric made into the curtain by a seamstress (or whatever they call them).