Every Neve console (ie:A-1039) left the factory with full documentation. There would have been a whole book for that desk with a complete set of drawings for every module in there, wire numbers, etc., etc...
I don't know if John Klett still has PDF's of all the old Neve modules on his site, but he's a good guy to contact if you're looking for drawings.
Beyond just the drawings for the Mic Pre/EQ, and routing modules, I suppose the thing you're after is the main drawing for the desk...
Just some thoughts...
Cheers, eh?
JB