Cory (12) and Joey (10) ask me almost everyday if we can work some more on the barn. It's just the three of us building it, so that makes for some good father-son time.
I would encourage all you dads out there to take any opportunity to do a similar project with your boys. It is awesome to take a few steps back at the end of the day to see what the boys and I accomplished together.
They are especially excited about the hay loft that they are claiming as their spot. I will load pics as we make progress, we only work on it a few hours here and there between other projects.