It would be very difficult to do perpetual with 1 big scrog net, I would say impossible to add and remove plants in that set up. You should try super cropping its the same effect as using scrog, but you can move your plants around.
The first one is usually where you find all the problems and the second one is better and the third is usually perfect and done in half the time
I used the metal stud drywall self tapping tech screws, they work well for holding.the strips to the frame. I have my drivers out side the tent, saves energy trying to keep the tent cool with the extraction fan. Looks good though, a definite improvement on the mars