SD - Thanks for the input. I would like to have the option of pumping out the holding tank manually at sea, but realistically, that is not something I would need very often. And to achieve this manual pumpout, the lavac options seemed to complicate things alot, including dockside pumpout pulling all waste through the Lavac pump. I think I will stick with the simpler approach shown on your diagram.
I think I mentioned to you before, but I decided to have my boat shipped home, instead of sailing it. I used Northeast Boat Hauling, form Maine, and was very happy with their service and price. The baot arrived on Saturday, and I have some minor, mostly cosmetic, work to do, before launching, in about a month,