Should car be on stands or wheels when installing 1/4 skins?

[challengerminded]

Hi, I know I've seen this topic before, but I want to ask anyway before I weld. Right now I have the cuda up on four stands,two up by the K-member, and two under the rear subframe near the torque box area. Rear and leafs are out and sitting on a dolly. No rear bumper, gas tank, shocks, etc... Car is stripped...Right now existing door edge lines up perfectly with the door pillar weld surface.

If I weld it now, and set it down on wheels, will it change?

[Challenger III]

Skins or full quarters? If the floors are all in and solid and the same with the wheel wells, you should be good to go. I would have the doors in place to double check fitment and edge contour. I replaced most of the back half sheet metal with weight on the rear suspension. Here is what I did when welding:
http://www.cuda-challenger.com/cc/index.php?topic=66668.30 . 
Check, double check and triple check before welding everything up! Good luck! 

[challengerminded]

Not 1/4's just skins from about 3 inches down from the top of the body. Also outer wheel wells, and trunk drop offs. Already did the trunk floor.
I think I'm ok to weld like this too. I have not touched the other side yet, and it still lines up.

Thanks, nice pictures.

 I also had 2, 71 Challengers when I was 19-21. (28 years ago), I could not afford a 71 when I was looking 4 years ago, so I got a 74 Barracuda.
Good Luck.