How do you figure out the capacity of your boat? I want build a flat-bottomed, zero rocker, zero flare outrigger canoe for mostly running up and down the river with a trolling motor. I'm thinking 21 or 22 inch beam, 16 feet length, with an eight foot outrigger off the port side. The trolling motor will be the primary propulsion, and I'll paddle if I have to. I mostly plan to fish bridge pilings at night. I'd run up fish, bridge piling and go straight back to the boat dock, I won't be turning much at all. Deep water no need for shallow water. My UJ pirogue can do that. I want a narrow long boat to go fast with low power (34lbs thrust trolling motor). It sounds crazy, but I really want to build it. Any suggestions or pitfalls to watch out for?