Stop in for a cup of coffee

So if I cut all of the spot welds out do I have to brace the car up to keep it straight to just put the roof skin on
I'd still brace the car up, but the inner bracing should hold it straight. The hard part of replacing the roof skin is all the spot welds in the gutters above the side doors and rear side windows. I'll get you a picture of what I'm talking about.