The paddle plans used to cost $45 but they have been free for a couple of years now.
They are very detailed with step by step instructions on all aspects of the building. There is a plan for both a classic 8ft double from Herreshoff – but with simpler and stronger blades of laminated plywood – as well as a more modern double.
The shafts are quite classic and the blades are slightly curved.
The two paddles shown here were made by the young men in the picture – a 15 year old and a 12 year old.
They are now building a canoe to go with the paddles. See here on the OZ woodwork forum
And here are the free plans for the paddles and 9ft oars.