Agreed on the single engine access. It's too bad that they never made a left / right configuration for a twin engine boat and have the serviceable components ( pumps, filters, alt. etc. on the inside. ) In my case ( Kha Shing 40 @ Twin Cummins ) I have by boat standards a decent engine room but one engine is almost non - serviceable. Frank B.
Except, how much "living, useable, everyday" space do you give up in a 48 foot boat to be able to sorta stand up while looking at your engines.
Now if they just could have made a remote raw water pump...
Bake: Can do! There's at least two Krogens running around having gensets with capped-off impeller areas running A/C raw water pumps for feed. Of course, they have auto shut-down sensors should the temp get too high. My Northern Lights 4.5KW unit has a pump with a ceramic seal on one side of the shaft. I've just put in a new seal and have a spare complete pump, but I've thought of doing the same thing if the seal craps out again.
A couple of years ago I saw a marinized International DT466 with an electric waterpump for raw feed. Seems reasonable if you have sufficient GPM and lift capacity through the engine's RPM range, and making it remote is a matter of extending the lines. They're out there.
Wet heads. I have found two principal reasons why couples give up cruising, health and the wife is not happy. Thus the question is not whether you spend a lot of time in the head but whether the wife is happy.