Shower Cabinet, square or quadrant (St Michaels TQ3)

I'm looking for a used glass or acrylic shower cabinet if anyone is having a bathroom refurbishment and has an old shower cabinet to get rid of. Any shape or size would work as I want to use it to make a porch (I will add a roof) entrance to a small outdoor cattery for foster cats so the cat doesn't escape as I go in to feed it. A base might be handy but not essential. Thank you!