It might be worth looking up the orignial Helsal, she was a very experimental FC craft. Post stressed concrete and she might have also had fine stainless steel
wires incorporated into the concrete to reinforce the surface layer above the mesh. She went on to win the sydney
But to be honest I cant see the benefit of using such an experimental method to build a large boat. The hull
is a tiny fraction of the work and cost, so economizing on the hull
is not the best way to save money
Building the hull in sections glued together is not a good idea for offshore
work IMHO. The biggest benefit of all the modern construction methods is the ability to make the entire hull and deck
into a big monocoque structure with no weak points and a minimum of joints. And even on a GRP boat the hull deck
joint can be a big source of problems, as can the keel/hull joint. To add extra joints is asking for problems.
On a traditional FC hull, a big source of problems is the way the deck joins the hull, if the deck is made from plywood
. Ideally it is heavily glassed over onto the hull to make the joint watertight and strong.
Ive seen a couple of fer -a- lite polyester plastered boats. They seem to have stood up well over the years, and are far lighter than traditional concrete.