That would be Marine Fabricators and its on Rte 3 in Topping. Had them custom make a set of rocket launchers a couple of years ago, they did a nice job. Don't know about rails or molds in a barn, but they can make whatever you need.
Look up Third Child on this, his father was the original manufacture of this boat. I have a 22' center console as well, and just so you know, I got Marine Fabricators to do my work. They did a great job and I would recommend them for anything!
The molds were destroyed when the Duck Farm was sold in the early 90's. There was a oat sold that had an extra bow rail and winshield, but no t-tops.
The owner of Marine Fabricators, Randy Moubray, made tops for Chesapeake when he was @ Tiffany Yachts. He is alos making a 18' boat that was made a while by Tides Boat Works in White Stone. The other top made was a Fiberglass hard top with stainless rails. That was done by Custom Marine Fabrication in New Bern, NC. Below is there contact information:
Mr. Donald Willis, Sr.
Custom Marine Fabrication, Inc.
2401 Highway 70 East
New Bern, North Carolina 28560
Mr. Randy L. Moubray
P.O. Box 140
Topping, Virginia 23169