I did...
on my former H31. I bought a 15 or 12 foot track, or something, from camping world. One of the inverted T types with carriers on it. I made a big "U" with the track, that included both the head and the standing room between the head door and the hanging locker. (If looking at a floor plan from the stern, a big "U", turned 90 degrees to the right, so that the opening was to the starboard.) So, to take a shower, one had to close the door towards for v-berth. This made a big shower area and kept me from having to stand on the head to take a shower..

I used a curtain/rod setup to creat a door, or sorts between the salon and the shower/head area that I had created.As for the drain, some went into the bilge, but I found a bilge pump that would fit under the grate. I do not know what make/model it was, only that is was an old one my father had sitting around. Several others here have looked unsuccessfully for one to fit. Unless you creat a sump/pump arrangement, I think the bilge is the only option.I know how you feel about the install, I spent weeks looking, planning and thinking before putting it up. I was afraid of the wrong install and all those little holes.Just do it.