Designed the fresh water system with a few key components:
25 Gal water tank (existing) with deck fill, vent
Water level sensor & gauge (12V)
Main shutoff valve
Water pump with strainer & silencing hoses (12V)
Accumulation tank
6 gal water heater (A/C)
Inline water purifier / filter
2 sinks & faucets: galley and head
Electric marine toilet (12V)
City water inlet with pressure regulator and a check valve to separate it from pump-based circuit
Deck shower
The goal is to get most of this under the head sink so the space will be pretty tight and new shelf would need to be built to support the water heater. Will be super fun to get that all installed, connected, and working.