We had one in our previous home. It worked fine (not a lot of water ended up outside the shower), but I was always cold. When we remodeled, we added a door.

I am a total fan of open showers and have encouraged several doubters here to go for it. But sorry, with a three foot width, I think you can't do it unless you put in a panel covering around half the six foot length. And even then, I think it will work only if you do a rain head that pours the water straight down on you rather than a wall-mounted regular shower head.

As I said, we had. 3' wide shower, and we had two very regular and very strong shower heads and had no problem with splashing. One shower head faced away from the opening, and one was on a perpendicular wall