question for anyone who has ideas about adding a shower unit to an existing bathtub unit only. what i am looking for is an exterior wall unit that shows the pipe on the outside of the wall. the wall already exists with the surround in place. i am looking for a spout unit that pipe unit can attach to with the shower head and mounts to the wall. i do not really want to take the wall apart to install a shower pipe in it. any advice would be greatly appreciated and put to good use.