Has anyone dealt with Auto Body Specialties?

If that's all you need to repair the floor, it will be fine.
I used a panel similar to that on my Dart Sport driver's side, and it worked out well.
Unless you are doing the full side, I would use these type of repair pans to save money especially on a driver that you need to make solid.
I got an AMD full driver's side for my '69 Valiant because it needed the full driver's side, and the passenger side was perfect.
The AMD panel fits almost perfectly, And that might be a factor if you are farming the work out.
I do my own work and welding, so my time means nothing when it comes to overall price..........

Check out my build thread at the link below my post for installation of a similar pan that you are considering if you have any doubt.

We're all not doing concours restos!