I agree, but what I would do is have a plate on each side of the floor wit one plate welded to frame and the other to the roll bar (cage)....That way, it can be unbolted and removed if repairs are needed.
Minimum 5-point Rollbar mandatory at 11.49 1/4 mile E.T. and running 134 mpg or slower. Rollbar good to 10.00 flat with unaltered firewall, floor and body (from firewall rearward, not counting wheel tubs). If firewall, floor or body are altered, Rollcage mandatory at 10.99. Rollcage mandatory at 135 mph.
All vehicles with OEM frame must have roll bar welded or bolted to
frame; installation of frame connectors on unibody cars does not
constitute a frame; therefore it is not necessary to have the roll bar
attached to the frame. Unibody cars with stock floor and firewall
(wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x
.125-inch steel plates on top and bottom of floor bolted together
with at least four 3/8-inch bolts and nuts, or weld main hoop to
rocker sill area with .125-inch reinforcing plates, with plates welded
completely.
If your ride has a frame, weld the bars to the frame after torching out the floor at each location, then make sheet metal covers that fit closely around the bar and that you can attach to the floor with sheet metal screws. The body will still sit on biscuits attached to the frame. You will only cut a hole in the floor that is big enough to weld the tubing to the frame at each location. 5-bar Rollbar, 5 holes. 8-point Rollcage, 8 holes, 12 point Rollcage, 12 holes.
If you have any plans to drag race the vehicle at a sanctioned drag strip, I urge you to seek out a shop to do the work, one that is familiar with the rules of the sanctioning body. I have had to force car owners to completely tear out the cage and start over on several occasions during my 20 year tenure as Chief Technical Inspector. OUCH.
If you are racing, find the rules for that class. I ran a NASCAR stock car class, limited late models aka street stocks. That required a cage that had to pass a stringent inspection. On those cars it was easier to take off the roof to install the cage.
If you're going that far, you should consider mounting the seat to the roll cage (there are kits available) and connecting the belts to the roll cage. The seat itself will have a minimum requirement for safety.
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