Door bar design seem to be good enough for Subaru Rally cars:
http://www.rally.subaru.com/images/building/b26.jpg
Also, we ain't done yet ... Still got more pieces to the puzzle.
http://www.rally.subaru.com/images/b28.jpg
This cage isn't being built to regulations since I won't use it to compete.
It'll be used for autoX, trackdays, street racing, the occasional drag strip meet, etc.
If it gets boring doing that - I'll upgrade to a CrMo cage built to regulations.
Simple as that : )