I have restored a few bad pins over the years, but the el dorado was by far the worst I ever under took. After I finished it I was surprise it turned out so good considering what I started with. My major concern was the smoke smell when done. I sanded ever inch and used sanding sealer and you could not smell any smoke.
As far as the atlantis goes the head had the most damage and the poor BG shows that. the cabinet is not to bad but will need a repaint due to the head being repainted. Ron webb repro the glass so there is glass to be had.
the King pin really isn't to bad all around. good BG and PF cabinet and head will get a repaint.
So if you come across a popular title in poor shape this shows it is worth trying to save.
I would not even put the hours in a poor title, just isn't worth all the time it takes. I put 200 hrs in the el dorado and only 170 bucks total including the machine.