Please take a minute to tell me if my plan is correct or not

When I did the quarter on my car, I just sliced it off about an inch below the factory spot welds. Used a grinder with a flapper wheel on the spot weld areas to wear through what was left of the quarter panel. That way I didn't have a bunch of holes everywhere. When I slid the quarter in place and got everything aligned, I used draw clecos to hold it in place. Installed the trunk lid, door, and rear valance to make sure of the alignment. Then started meltin metal. I like plug welding them on because the finished product look damn near like a spot weld.One thing to do before starting this project is to put the car in one spot and shore it up, and level it out. Don't rely on the way the car sits on its suspension.