Thanks, I did see a you tube video of that method. There is really a wealth of knowledge here from everyone. My heartfelt thanks to all.
After some help for everyone here and some research, I'm planning to have 2 drills ready. One with a small center drill and the other with my Blair spot weld cutter. I'll start a small hole to keep the spot weld bit from walking. This is more time consuming but that should keep the hole and distortion to a minimum. I may change my mind after beginning this task and see how it plays out.
This began because I looked at the cost of replacing all the flooring, inner and outer rockers, rear quarter, inner and outer wheel wells, rear trunk channel, and lower fender panels. I found a nearly rust free skylark for much less money than buying all the panels. Plus it's the original type sheet metal not thinner reproduction metal. Not to mention, all the things that aren't reproduced.