I was looking to possibility adding oars and oar locks to a Gheenoe 13.
I was hoping someone might be able to point me in the right direction. I would like to be able to row from two locations based on occupants.
Mount 'em where they feel comfortable.
Do so by first installing them on blocks of 2x4 and clamp them to the hull.
Try them in different spots till you find the perfect place.
After you find the right spot, bolt 'em to the hull.
I've installed oars on dinghys, small sailboats and a couple of aluminum jon boats.
Figure out where you want to sit. Test the oarlocks for position then mount 'em.
Oars have a formula to determine the correct length, I had it in a reference book years ago.
Now you can find it on line... ;D