wrote:
OK - I found picture of the Jarvis Newman head compartment, as well as
similar suites on a Grand Banks:

http://www.tinyurl.com/ylntjb

and an Albin:

http://www.tinyurl.com/ya9dat

Most likely this is Melamine (over plywood) or its close cousin
'Formica' (plastic laminate).

If you're building from scratch, you might want to consider an "epoxy
laminate" head compartment. By this I mean that all bulkheads /
cabinetry are marine plywood with (say) several layers of 10-15 oz
fiberglass expoxied thereon. Over this do a layer of microbaloons (or
your favorite fairing compound) and epoxy, then sand smooth. Apply an
epoxy primer, then - depending on the ammount of gloss you'd like in
the final product - roll on a few coats of (white) one or two-part LPU
or enamel.

Trim with your favoite wood door fronts / moldings (also epoxy coated)
and you've got an easy to clean "rot and delamination proof" head.

MW

No one would ever use Melamine on a boat. It's heavy, has little
structural integrity and the surface is thin and easily damaged.

Having said that, someone will say they used it.

Formica is good, what you're looking at is molded fiberglass, which is
the best.