you can build you rim better than anyone else because you can build it right in your frame and the frame is just like a truing stand. flip your bike upside down and use your brakes as guides to true your rim. It's fun, and all you gotta do is copy your other rim. And since any new rim needs to be adjusted after it's broken in you'll be be familiar with the tensioning of spokes. You can even build extra wheels. or have extra wheels with different tires for different riding conditions.