I built timber trusses with bottom cords 8 X 8. The king post is also an 8 X 8. My top cords are 8 X 7 so I have a step back look and my web beams are 7 X 6 for a step back look also. The Nailers are a full 2 X 6 that I put on top of the trusses and then covered with reclaimed galvanized barn roofing.
The trusses are 20 feet wide and 6 foot tall.
If we would have bought beams for this project, we estimated we saved $15,000.