Dirk,
I stuck my head in there but can see anything useful. There's a big block of foam just aft of the tang (and bulkhead?) that obscures everything. Sorry!
I bought a badly damaged 20 that had numerous longitudinal cracks that the previous owner said were caused during trailering (hard to picture). Paid $400 and got a great mast, rudders and a Trailex alum trl I sold to a guy in Socal for $450. And two 6' bow sections.
I've had the plate around the tang come loose, but the tangs themselves have always seemed solid.

dave