Fred, if you don't own a GCR go to www.scca.org/ click on "Club Racing", click on "Cars & Rules", click on "2006 SCCA GCR" & read the rules under 2006 SCCA GCR ITCS. Keep in mind that if there is no rule that says you can do something then you can't do that something.
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David, when you get to my age all those damn books start to run together ! I have a 2006 GCR and in fact have them all the way back to the early 90's late 80's when they were seperate sections in old notebooks but I was looking to see how different these could be interpreted... seems to me that what I might read as black and white will get 10 different gray replys.... As example and as you stated the roll cage thing is not as clear as I would like but I understand the spirit................... I think