G'day Stephen.
I don't want to offend you but.
A lot of work with that one. Pic #9 is about how I got my A7 plunger and add 1" of chook poo over it. Took about a year and AU$3000 back in "81. Gives you an idea of cost to bring back to life. If I were to make an offer it would be £1000 tops.
Very best of luck with it.
Cheers