Built to the rules and to the prefered design:
Quote:
15.6.13 Mounting Points
The roll cage shall be mounted to the floor area of the car in six, seven, or eight points. The cage shall not go through the firewall. The seventh and eighth points must attach to the firewall or front fender wells. All cage attachment points must be mounted to plates or a mounting box (plinth). Each required cage bar shall terminate on a plate with a 360 degree weld to the mounting plate, except as specified in Section 15.6.14.B. There shall be only one (1) mounting “point” per plate. This point is defined as where the “required tube” mounts. All additional tubes mounted to that plate must be mounted as close to the required tube as possible [Ref: (15.6.14.B)]. It is recommended that plinth boxes use a bottom support plate in cases where the edges of the box may punch through the sheet metal.
15.6.14 Mounting Plates
Each mounting plate shall be no greater than one hundred (100) square inches and no greater than twelve (12) inches or less than two (2) inches on a side. Welded mounting plates shall be at least 0.080-inch thick. Plates may extend onto vertical sections of the structure. Any mounting plate may be multi-angled, but shall not exceed one hundred (100) square inches total including vertical sections. Each mounting plate should have an area of not less than nine (9) square inches.
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and yes - I would consider them to be on par with the subframe or subframe connectors wrt strength.