Re: Starrett-Jenks Morgan45 info-opinions
On composting toilets and Coast Guard approval. You do NOT need a commercial unit in order for it to be "Coast Guard Approved." As long as there is no discharge overboard there is no applicable regulation. The regulations and approvals concern overboard discharges. Once the worms have finished turning your waste into dirt it may be carried ashore and disposed of in a landfill. You will need to do this no more than once every few months, depending on the size of your system. Best is to have two containers, one currently in use, therefore kind of 'fresh,' the other set aside somewhere to finish the process before landside disposal.
We have no 'holding tank' but we did convert the bilges from the mast step area aft to the bulkhead just for'd of the c'way into three fresh water tanks. They were completely lined in fresh white fiberglas and epoxy and sealed over with permanent 3/4" mahogany ply floors. Access to each is by 8" deck-plates.
As to motors -- agreed that the way most harbours are laid out these days it will be difficult -- illegal in fact in some. But we sailed an IOD with no motor and had no problem docking etc. And sailors ave been doing it for centuries or millenia before engines were invented. We do plan an electric propulsion system but would rather not rely on it. And there are always oars. Far more reliable than diesel or other engines.