Not sure how to get ahold of the Rockhall Owner
I had mine out for engine work 2 weeks ago, but didn't get any close ups of the rudder....I will send you the few pics I did take with my IPHONE though. It is a Skeg hung rudder. She is coming out for the season in November then I can get you any pics you might request.
Hopefully whoever bought that boat on Ebay is a Sailnet member and will find us - I couldn't get the seller's info from the marina. Snipe63 got his boat as a Katrina rescue..so it isn't him.
As far as the HIN..I know how Bristol HIN numbers work but still can't find it. Maryland actually assigned me a generic HIN - which I am responsible for putting on the boat. I will probably do this over the winter.
Take care and let me know what your search yields.