One thing you might think about. I have my darkroom in a basement and the humidity can get pretty high. I had a set of Schneider lenses all get hazy and one got fungus. Now I keep my lenses in a Tuperware container with silica bags to keep them dry. Changing lenses is so completely easy and quick that using a turret to make it even easier is not worth anything to me. I would rather keep my lenses in the dry box unless I am using them. Having a turret with all my lenses on it would be tempting to just leave them all out all the time.
Dennis