Simple test for junk on this occasion
The pictures clearly show a structure using aluminium honeycomb core. How many yacht structures or sports surf equipment use aluminium core?
Next, the core is still in place to some extent. This indicates a high level of corrosion resistance, and probably indicates PAA and primed core and this is typical of top end aircraft materials selection, but I am not sure of what was actually used on 777 aircraft. Even short term exposure in a galvanic combination of aluminium and carbon in a corrosive marine environment without high-end corrosion protection would see the core gone in a short time.
What puzzles me is the insert in the earlier posting (#444?) which shows a carbon skin with a nomex core (not aluminium). What the heck is that picture? It looks like a training aid picture, and probably has no relevance to the "junk". What next?
Regards
Blakmax