biggyj
I use to fish some pretty big lakes when I fished from a pontoon boat. Would never want to row them plus on a windy day you can't beat an electric motor. I had a Minn Kota 30lb with a wheel chair battery gel cel. Small and light weight and it would last me a full day.
Like Tungsten said, travel in reverse when crossing a lake and use your fins to steer. Just tighten the knob on the motor shaft once you get her going straight. Very relaxing too !
Here are some pics from mine regarding the platform, dry box, motor and anchor mount. Mine is an aluminium Scadden and I had a welder do the mods for me. If you need used aluminium go to Federal metals over on 52nd SE. Flat sheet goods plus tubing. Cheap !