I have my "two cents worth" to add here.... since I have been told that I too am merely an armchair expert, it can't be worth any more than that!.....
DO NOT get too fixated on the "under chassis sub connectors".... the bulk of Monza (and Vega) stock chassis strength is in the rocker panels! The so-called front framework is really little more than stiffeners in the floor so that the seat bolts don't pull through. You will find that, if you drill a hole through the inner side of the rocker panel (from under the car towards the outside) it is two layers thick and totalling well over 1/8"... Look carefully at the "boxed members at the rear of the front wheel wells and you will see that they wrap around and connect with the rocker panels.... at the rear of the rocker panels, similar "boxed members" are also present.
As has been stated earlier, put any/all front to rear connectors inside the car - both for rules compliance AND aero-drag under the car.....
And, if you are serious about a "safe" roll cage, spend the $100 or so extra and get tubing that is made here in North America by a reputable tube manufacturer!.... over the course of 10 or so years of running your car, the extra cost will NOT amount to a whole lot in dollars and cents!
If you are looking for cages to copy or emulate, look us and our Chevy Vega up.... Although were ARE ONLY an Altered Class car due to a non stock frame.... See pic for the Vega....
