Join Date: Jun 2008
Location: Tampa, FL
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Read what the brochure says...
"The deck and internal cabin headliner sandwich end grain balsa..."
Sounds to me like a description of fiberglass on top, plywood on the bottom (the headliner), and balsa in between. The picture is just vague enough so that you really can't be certain if the balsa is completely encased in fiberglass or not.
On the other hand, this is a 30+ year old boat that has held up well and has no soft spots. If it were inherently weak, significant problems would have become apparent by now. Though it is a little unconventional, it appears that Nor'west put it together well. Frankly, I wouldn't worry about it.