Spotted this expedition boat rowing up to Swanwick Hard recently. The owner and crew weren't especially talkative but I did find out it was built from a kit designed by CLC - Chesapeake Light Craft.
They were probably a little preoccupied with recovering the boat onto that enormous trailer.
A bit of internet research reveals that the Southwester Dory is sold in the UK as a kit with options for rowing, motoring or sailing. Apparently there's a Northeaster Dory which is slightly smaller, the Southwester is 18' 10", 62" beam and weights 250lbs. lovely boat.