Lookin' good. When and where do the seats come in? I have never seen a driftboat with a walk beside rower's seat, but then, I'm a very back number.
I don't think you need flotation in a drift boat unless required to pass a Coast Guard inspection. Then, I would put it in to satisfy the inspection and then take it out Use the space to store your raingear, etc. Adds weight. If you dump the boat, get your *** to the beach. Last thing you need to do is float down the river hanging onto the boat. It and you will wind up in a logjam. Most likely, dead. Definitely wear a flotation vest. I have run many miles of river, some pretty challenging, so I don't think I'm blowing smoke.