It is very important to integrate the Roll Cage into the body.
This further stiffens the chassis and effectively makes the Cage part of the frame.
Kind of like a tubular chassis that is incorporated into the car's structure.
So metal tabs are needed to make the A and B Pillars part of the Cage.
Here is the passenger side with the tab installed.
Driver's side detail.
The rear Roll Cage is now part of the car and it is remarkably stiffer now.
Now to complete the forward tubes and we are done and ready for paint.