Something else to consider.
The earliest models of the P323 used a "flip-down" sink instead of
the "swing-out" design. Of course, this used up even more of the
behind-the-head storage space, but gave you a much bigger sink.
These photos are from hull #18 (not mine, but one I looked at
in 2009 when we were boat hunting). If you look closely, you can
see the cables that support the deployed sink.