i did buy two premium 2x4 8ft.question to figure out is how big of a paddle. i may start with a piece of plywood just to get the feel of it. probably trimming the 2x4 in half and bolting the blade to it.
The length of the oar is the important thing. Too short won't let you get a bite in the water. Too long makes you fight the natural floatation of the oar.