Sounds like you had a Lame cop pull you over.
before I put the tube doors on, I drove around all summer without any doors and never got pulled over. I even passed cops several times who never even batted an eye. they probably just had sympathy on my truck.
Anyway i was courious and i started digging. I found nothing in the CA vehicle codes that specifically stated that a. "you have to have doors" or b. "you cannot drive without doors" I also found nothing about that lip along the bottom. You are required to have 2 mirrors so that was illegal. I'm putting a cheap one onto my drivers side tube door to satisfy that one.
But i suppose they could get you on that "unsafe mod" minisimp.
this was over a year ago, so maybee some things have changed.
http://dmv.ca.gov/pubs/vctop/vc/vc.htmhttp://www.leginfo.ca.gov/calaw.htmlhttp://www.defend-me.com/California-Vehicle-Code/ 
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