Performed the first test of the pluming by connecting a hose to the city water inlet. Almost everything worked just fine. So awesome to have faucets in the galley and head working! A few leaks showed up but I think all of them can be fixed with adding plumbers tape. Off to a good start!
With help from my friend Victor, we bent and tapped aluminum brackets and fitted new holding tank cover panel. Thumb screws will allow easy access to the Y-valve and seacocks under the sink.