I followed the plans for my XL and found the 36" length too short. 5'9" avg. build. When sitting in the seat I felt like I was sliding forward. I added an additional 6". Now I feel like I'm more settled in a "sling." It's very comfortable. Plenty of room above the torque tube. Matter of fact, I wish I added 7". Also, it would have been easier to go long and shorten the seat rather then having to lengthen it after finishing it. The width is ok.