Superstructure laminations. This is a bit hard to visualize, it even took me awhile and I really have been all over this and other 48' Kadey-Krogens. What you are looking at is the super structure "upside down". The opening you see is actually the hatch into the cockpit lazarette from below the deck. OK, no worries, come aboard and I can explain it all!
Photo courtesy Tom Button, Kadey Krogen Yachts