'Tabbing' is permitted in Production & GT classes. It is not permitted in IT. A tab becomes another attachment point. You are permitted a maximum of 6 points in IT with two additional optional mount points to the firewall. A tab is another attachment point.
But you can make the cage an interference fit! The hot set up seems to be to cut holes in the floor to drop the cage down to provide access for welding to the top joints, then wedge the cage up and cover the holes with your mounting plates. The 'jacking' point idea is, IMHO a very clever yet legal interpretation of the rules. It 'touches' but is not attached.
After I converted my IT car to Prod, I (legally) added tabs to to tie the 'A' and 'B' pillars to the cage. It made a world of difference to the chassis stiffness!
2002 Cen-Div ITC Champ
(Converted to G-Prod in 2003)
(Bumped to H-Prod in 2008)
2008, 2011 HP Cen-Div Champ
2011 HP National Champ
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