I found it was easier it find good quality closet rod than it was to find good quality 2x2s. The closet rods are already round, so that saves planeing the 2x2s round.

I have made these with just about any glue lying around the house TiteBond II, PL Premium, Elmer's Ultimate, you name it.

I like using at least 3 clamps I on each oar - but feel free to do whatever you want.