My 2 cents,
My first dinghy kept dumping me out much to the delight of my spouse!! When I ask an old time boat builder( Stu Smith) ,his comment was "the faster they throw you out the better they row?"
many decades later, I got a fiberglass Whitehall skiff. Looked great, Stable....but when...
The Sung Harbor boats were indeed built in St Petersburg. The designer was Ross A Sackett in the last 1960's. They were and are great little boat. Not bad for a 50 year old boat:) There are 3 , 13 ft Thundercat , 10 ft Sailing Wherry, and a 8 ft Thunderbird Sailing Dinghy.
Randy in FL