drifting a car, especially one that is the size and weight of an SC is not a good way to "learn"...you need to start with an 86 Corolla, or a 240sx...even better, a 1984 Nissan 200sx SE with the VQ30...

As for your quarter panel, and not sure if anyone already told you, but it will have to be cut out, and have another one welded in place...not to mention put on a frame machine to be sure that the spine of the car is not out of alignment.

IF you were in TX, I could replace the panel for you for $400 with primer..no paint...AND, would be willing to tech you proper correction when a drift goes bad so your not kissing walls..

I'm not trying to bash you in any way, but what you did here was not smart at all..if your going to tech yourself to drift, make sure that NO BODY IS AROUND YOU!!! and no one in the car with you!!