I remember seeing a single tube lower crash guard as described, but can't find my link right now. I did find this one from Darryl at XF6, plus he has floorboards for it too.
http://xf6-custom.com/partpages/rollbar.htmlYou may be able to base something off of that...
Mike "Dodis"
That guy did a great job.Thats what I am talking about.I wish there wer more pictures of that.