My first time reading this. Wow, wicked work there. That was some resto. I took welding in school (stick and gas) and I've done some minor body work, but that is quite extensive.
VERY NICE WORK!!
As for the colors, I don't want to add to your choices, but I remember my dad saying Pink and charcoal grey was quite the color combo in the '50-'60's. The purple idea would look pretty cool. I also like a true copper (and not that burnt orange everyone is going for these days) but a true copper. I've seen a 'Cuda with a dark copper color, and wow! Looks like it had some brown in it, to darken it up.
The color was stunning.
I can't wait when you decide to paint it up, and post the pics!!!