seems, you already have done a good research
hopefully some of these people may help. did you tried contacting Eric Graham himself - does anyone know what he is doing right now anyway?
did you got the whole pdf of the AmigaWorld issue? i'd like to get this one too - I open a request for it
good luck, and keep us informed.
Edit#1: here is a contact adress of E. Graham, a company he is/was working on:
http://www.diralg.com/ - if not already sold, you can buy his old home