hey ebb, i was wondering what your final plan is for plumbing, etc.
where/how much are your custom water tanks?
where is your holding tank going?
my current water tank is the original gavanized or common steel (can't tell which) and has rusted to oblivion.
and the holding tank was a 15-year old- .00005 mL capacity plastic bladder. originally sold as the (not kidding here) "Poo-Loo System" when i pulled on the handle to check the condition, the handle pulled out of the ultra thin plastic walls. so i am now totally out of USCG plumbing code. (good thing i am also totally out of the water...)
anyway, let us know your longterm plumbing plans (especially in-boat arragements and sources)

-km #3