[arbezc]

Thanks for your advice guys,
962 was very helpful a while back. I've ordered a clamp to try his suggestion of using a long bar to pry the worst area down. The car is inverted right now so it’s a bit difficult to hammer the dents out. I'll flip it shortly & give it a shot.
It’s looking more & more that the undercoating will need to be fully removed. I was hoping to save the interior sound deadening therefore a puller approach over a lot of hammer & dolly. Most of the car including the floor pan is very rust free. From what you are saying it may not be possible to save the sound deadening where there’s dents.
I can pick up a cheap stud gun for a bit over $200 Canadian. I likely try one along with hammer & dolly.
Thanks again