Changing shower to a bathtub

We have a so called "garden tub" that's about 24"x36" in our coach. We have tried using it as a tub, but as said, the hot water capacity really limits the amount of water you can fill it with. Getting in and out of the limited space is also not that easy. It does make for a little roomier shower area though, than the common 30" units. As far as sealing goes, it's no different than many shower stalls where the wall surround extends over a lip on the tub edges. At the front, we originally had a 3-section sliding door, but have since replaced it with a retractable shower screen that's sort of like window shade mounted sideways. The screen has a lower track that prevents water spray from escaping the tub area. The screen opens up all but a couple of inches of the full tub front, making entry/exit and tub cleaning much easier.