when I removed my body, I made some saw horses out of 4x4's. I placed one going across the front @ the firewall body mounts, and the other was placed just in front of the wheel wells sitting on the bracing in that area. The car sat like that for a couple years with no door, windows etc while I worked on it. Never had any problems.
As far as removing it I used a cherry picker and did front first, then back. I placed the body on 8' 4x4's sitting on jack stands to clear the frame initially, then placed on the saw horses