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
I built my own version of the Essex Industries canoe rowing rig for my 15-4. Works great with 6' aluminum oars, while I sit on a milk crate covered with a square flotation cushion, (my Gheenoe has no middle seat). I can row for hours, moves the boat right along too. Great for areas off limits to motors, or enjoyed just for the exercise and quiet. No mods to your Gheenoe. Easy on and easy off. Built mine using oak 1x3"s. Because it is adjustable, this setup can also be used on other canoes.
As a backup to a motor, I carry a 96" SeaSense x-treme kayak paddle found on Amazon for only $32. Works very well for slow trolling or emergency.