12×6' is a very very narrow space. your shower is going to need to all the way in the back. 5x5 foot for a roll in shower is ada. I use a wheelchair and I have a 10 1/2×12 1/2' bathroom. honestly, it's much too narrow. I would consider modifying my layout and stealing real estate from another area.

A floor plan would be a good start.

What would you like in your bathroom? Double sink vanity? Shower only? Shower/Tub combo? Shower and separate tub?

I currently have the same problem! I wanted that but the tiler didn't do it. I saw it after the shower was finished tiling (when I got home from work). They told me it was too difficult to cut the porcelain tile in a triangle shape and install. I did some research and I can't find a product that can hold weight, even if it is just to shave my leg! I suppose I should have had a triangle corner with a base (that wasn't floating) but I think it is too late. Hopefully someone can tell both of us a better answer. Just realize this was posted July 2014....... where you able to solve the problem??????