Holy Cow I just saw this and it's almost a year old. Believe it or not I am just now finishing the other Oar. I work for the DoD so sometimes I get busy ;-)
I made them out of a single piece of spruce. Took forever to find a piece that wasn't knotty or the grain didn't run out on. I will post pics if I can remember, and have time!
Where do you get your marine plywood? I need some small pieces for a few parts and have never bought any.
We have a good stash of 1/4" and 1/2" 1088 meranti. We can help you out. Give me a call.