Legs and main post collars cut out with a 4 1/2" cutting wheel in a grinder. I cut the angles first, then connected the lines with a square. Then I do my best to angle the cutting wheel at 30 and 60 degree angles to connect the cuts. It's the best way I can do it for now. A large, compound miter bandsaw is in my future. The cutting wheel method really didn't take very long at all. It works for now.
I double check my 5' measurement. The casters should take me close to 6'. I can fine tune the height of the collar that attaches to the beam to get my desired height.