We are cutting out our current main hoop to bend and weld in a new, taller hoop to meet the rollover requirement however we have a question on 18.104.22.168 about the main hoop. Our chassis, including the main and front hoops, is made out of 1" 4130(mostly round tubing, some square). We see in the third statement of the referenced rule section:
The Main Hoop must extend from the lowest Frame Member on one side of the Frame, up, over and down the lowest Frame Member on the other side of the Frame.
but then later in this same section we see:
On vehicles where the Primary Structure is not made from steel tubes, the Main Hoop must be continuous and extend down to the bottom of the Frame.
This suggests to us that if the hoop/chassis is not constructed from steel, the hoop must be the lowest point of the frame. Our car is all steel so we do not think we need to do this. It would make the retrofitting of our car much simpler and stronger as well due to the minimization of cuts and rewelds needed.
Since our structure is all steel, is it within the rules to extend the main hoop to tie in to the top of the frame rails without having to cut out the current piece and go through again?