Okay, here's how to do it. This is one of the best kept secrets in all the catsailing world. In fact, I'm surprised this how-to info is not more readily available.

Best place to mount it on the H16 is on the tramp just aft of the mast (**with the portopotty user facing aft**). This works for most commercially available portopotty units. You'll need some 1.5" long nuts/bolts (SS recommended), galvanized water heater mounting straps (bolts should just fit through the holes), rubber washers, epoxy, 4 2x4s, 8" lag bolts, tie down straps, heavy bailing wire, and an opaque shower curtain. The portopotty should be empty for the installation process--it's lighter that way.

First, you need a firm platform for the portopotty. Mount the 2x4s across the tramp just aft of the front crossbar and back about 18-20"; this give the portapotty a good foothold. Use two 2x4s above the crossbars and two below; "sandwich" the crossbars with the 2x4s and attach boards with the lag bolts. Next, place the unit on the boards and center it. Epoxy the head of two bolts onto the front facing side of the unit. Bend the water heater strap around the base of the mast to form a U-shaped bracket. Then bend the ends out so you can bolt the strap to the epoxied bolts,using the rubber washers to act as bushings. Make and bolt another strap around the mast about 5-6' up. Make a loop with the heavy wire, feed the opaque shower curtain on it and fasten this to the strap on the mast. This is the privacy curtain. Use the tie down straps to hold the unit in place (and keep the lid down) when not in use.

Good luck with this noble project.