What's next? Well I've basically just been pulling things apart and hoping that I've taken enough photos to put everything back together again.
Boards are labeled
 

Removed and sent to Beaky


The rest of the underside of the playfield has also been labeled, pics taken and assembly's taken apart. Because this is my first restoration and I'm not confident about putting everything back together again, I'm taking one of everything apart before polishing, cleaning, rezincing where necessary and replacing for new where possible and reinstalling before taking the rest of the assemblies off. This way ill always have something to copy off if I'm not sure how to get it back together.
 I'm also trying to keep items in groups where possible so it's easier to work out which bits go back together. It surprised me just how many parts make up a drop target assemble before I took one apart.