Rich -
We did pretty much all of the same mods that Tom did (I keep telling him if he ever gets on our boat it will look rather familiar!):

• separate shower spray head and valve (I think these were Scandvik).  Sping clips hold the hose in place when not in use.
• replaced sink faucet with single lever faucet (also Scandvik), which saves water.  (Also mounted a teak CD caddy repurposed as a holder for shower soap and shampoo, etc.);
• added an angled teak lip on bottom of the head compartment door (to prevent the spray from running under the door and into the salon);
• redid the shower seat so that its pinned onto dowels (rather than screwed in), so that its readily removable to clean underneath on occasion;
• replaced the original sump pump with an outlet (an offset through-hull fitting) installed at the bottom of the sump pan connected to a hose that is routed through the bilge, thence under the port forward settee, thence back into the head compartment to a Whale gulper pump mounted behind the small door over the toilet, and thence (after a vacuum break loop) to the seacock under the shower seat.  This allows the sump to be completely emptied.

Pictures of all these mods are attached.

We desisted from using the shower the first year we owned the boat because there was no shower curtain.  But then we discovered it was totally unnecessary, and thus we don't have one (which would just take up a lot of room).  The head compartment seems to have been well designed by Catalina (I believe) NOT to need one, and as long as the cabinets are closed, no spray from the shower goes anywhere that it shouldn't.  The head compartment dries out very quickly, and if anything the occasional shower keeps it cleaner. 

We also, when cruising, frequently make use of camping-style solar showers, which we suspend when ready over the hatch for the head using a spare halyard.  They work quite well, particularly when we haven't made use of the engine for a while and thus there's no hot water in the heater tank.

- Matthew