Rocker replacement questions

I need to replace the rocker and part of the front fender on a unibody (fenders cannot be unbolted). I have the outer rocker and the lower fender patch panels (I'll still need to fab some patches). The sections are not rusty, but the PO really mangled an old repair. I plan to convert this to a 2-door and chop it, but I figured the rocker needed to be repaired before I attempted any of that.
How would you approach this/in what order? YouTube video recommendations? How do you hammer & dolly the welds?
It's a Jaguar Mk2, but the Corvair and others have similar body structures.

 

Another view of the quality welds. I don't have a pic of the B pillar/rocker union.

 

There’s some nice pics here. We call them sills over here so if you google mk2 Jaguar sill rather than rocker you’ll probably get more hits

https://landieman.com/2016/08/21/remaining-body-repairs-part-2/

 

Thanks, that's a big help. I wasn't expecting actual Mk2 advice!

Any tips on planishing the welds on a fender patch? All the videos I found online had the fender unbolted from the car, which isn't possible here.

 

Can you access the inside of the fender/sill area? You might have to make something to back your body hammer up in there. I wouldn't hesitate to cut that mess out and install one large panel even if I didn't have access to the back of the panel. Working slowly and carefully, one could replace that panel with little hammer/dolly work and have a much better result than what's there.

 

Martin Robey in Nuneaton UK can supply almost any part for most Jaguars. It may be easier and a better result with new high quality parts. I have no association to them, but I have used their parts before.

 

That's where my replacement panels came from. SNG and Moss get their parts from Robey