I am a retired carpenter so I have built alot of tub surrounds and installed alot of bathtubs. I am currently renovating a small bath (8 X 12') upstairs and my wife wants to install a soaking, drop in tub. No problem there. However, she also wants to install a shower for the tub. How can I allow for water drainage off of the tub surround when showering? She doesn't like my idea of a shower curtain that hangs from the ceiling and would perfer a glass wall of some type. The tub will have at least a 4" tile deck around it and the lip of the tub is raised 2". Any ideas?