Doing the math…
September 9th, 2010
The plans are extremely detailed (very good) and only basic skills are assumed (even better). However, the author is clearly extremely adept with an angle grinder, and the photos make mitering steel tube for welding look easy. This seems unlikely.
I came across this calculator which will make life a lot easier. Enter in the tube size and required angle and voila!
Wrap that around your tube and you’re ready to go.