I am going with a Titanium rollover rather than the plans fiberglass headrest.
The three drawings below are what I gave a quality welding operation to work from, I'm yet to learn CAD. They did a great job. 'Grip Sport' in Thomastown, Victoria, Australia who also supplied some titanium flat plate that they bent to make the angle sections.
The tubing I suppied to the fabricators came from 'Titanium Joe" in Canada
Titanuim 1" OD tube Grade 9 3AL2.5V CWSR 0.0510" thick
I ordered 2 pieces 60" long and one piece 42" long and that was about the right quantity. There was a couple of feel left over some of which was used for test bending.
The design I mainly stole from pictures of Wayne Blacklers beautiful Long-EZ and I just went a little lighter in the material diameter. Its not like I'm ever going to test this thing after all. If I do and survive then I'll say the design is good. I'm sure it will be great for ground handling.