Another thing to consider about V bottom and round bottom hulls is the
value of the bilge space.   A flat bottom offers little or no useful
space in the bilge for tankage, and other stowage.... This is not
insignificant, as deep down is the ideal location for such thing as
liquids and batteries, and other heavy stuff.  Built in tankage is also
insurance if you run onto a coral head, and rip into the bottom..... it
can prevent the main hull(s) from flooding.  The entire bilge in a Deep
V or round bottom hull could be sealed, with watertight access ports,
and ideally each bulkhead would make a separate compartment without any
connection to the adjacent compartments.

                            H.W.