Thanks fella's, wasn't able to work on it yesterday but managed to work on it today, mostly putting some All Metal and filler on some areas that it was not possible or not practical to work the damage out so some slight filling was required.
Still have some holes to weld up so I had to drop the seats in to establish again which were the holes from the non mopar bucket seats that needed welding up. The bench seat holes are straight forward and will stay for when I swap out the seats, just marked the correct ones with some weld thru primer.
I like to weld these large holes on both sides before I do any grinding, when you weld against the copper backing the weld tends to be quite porous and pitted on that side so re-welding flows in the pitting and any pinholes and makes for a much nicer result then I grind both sides down. The trick is to do both sides before grinding one side so you have a thick weld your re-welding into and it won't blow thru at all.