In looking at construction possibilities, I keep coming to a rather
unique method..... or at least it looks unique to me. That is to slice
the foam into planks say 15 - 20 cm wide.   Wrap the individual planks
with fabric on the bias or with triax, sticking it to the planks using
spray adhesive.    Then do the infusion layup, laying fabric down, then
the planks, all pushed tightly together, then the interior fabric.  
Then infuse.

    This of course is more work, but has multiple advantages,
especially where foams like XPS are being used.   The interface between
the planks will be a solid glass rib of two plies, and this will make a
stiffener / stringer.  The ribs will also facilitate infusion, creating
a flow path between the surfaces. But most important, they produce a
solid glass longitudinal shear web at each joint, reducing concerns
about core separation from the surface plies.   The challenge for me at
least is the fact that the edge where the hull side meets the bottom is
going to be curved, as is the top edge.... but it's all doable, just
challenging.

H.W.

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