!931 Standard Roadster Patch Panel Work

[California Charlie]

After all the time of preparing for this body work effort I'm finally all setup with MIG and TIG welders, grinders, and whatever else equipment I may need to do the Patch Panel Work on my 1931 Standard Roadster. I'm all ready to get into this work, but I'm a little gun shy on starting this without having the "absolute" and "best way" instructional information as to how to go about this effort.

What I believe I can do at this point in time is:

I have two entire 31 Roadster front cowl panels which I will be doing "Plug Welds" to attach the full size panels into place. I don't have a problem with that issue. I believe I'm okay in that respect.

What I'm having difficulty in figuring how to proceed is with the following:

Replacing the body rear quarters and rear wheel wells. Both sides.

I have Volume 3 of "HOW TO RESTORE YOUR MODEL A FORD" which has an article on doing the above work, however for those of you who have actually performed this flange and rivet body work (and seen this article) is this reflective of the best method?

I've seen offered "Butt Weld Clamps" offered for replacement sheet metal panel work. That differs from the instructional information given above which uses a "Flange Tool" to flange the panel for this work. Is one method better than the other?

I'm also needing to replace the rear sections of my Subrails. Is this a method where you just simply cutout the bad section and butt up and weld the new section in place?

I apologize for so many questions, but I've got my sleeves rolled up to do this work and I just need the appropriate direction as to how to proceed with the right and best way of doing this.

Thanks in advance for everyone who may offer assistance with my questions. Hopefully this will also help others who are ready to proceed with this type of body work. California Charlie a "Backyard Mechanic" up to the challenge.