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I ran the pottie waste and vent hose through a 3 inch conduit I installed in the port coaming, which is completely hidden from view in the aft berth. I was also able to run a 3/4 inch water line for a transom shower through the 3 inch conduit, and still have room left over if I need to run any wires.

In order to install the 3 inch conduit, I first cut a 3-1/2 hole in the aft end of the hanging locker.

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Due to the foam flotation, it was somewhat difficult, but I was able to insert the 3 inch conduit all the way back to the aft compartment without removing any foam.

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I made a trim ring cut out from cutting board material to provide a finished clean look.

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This is the 5 gallon tank with hoses connected. The nice thing about this MSD, is that if there are no pump out stations available, the caps that came with the unit can simply be screwed on enabling removing the tank for manual dumping.

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Here you can see the deck fittings connections inside the aft compartment.

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I decided to install the deck fittings on the stern. There is no wood to be concerned with there, and being a vertical surface reduces the chance of a leak.

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I intend to install a cover/shelf over the compartment, to further hide the hoses.