I am with JH on this one...any one of those guys at the machine shop has taken apart more heads than I have.
You are an Australian with a nice paint job! My first Benz was a Euro 66 250S, and the picture of yours brings back fond memories.
you might check out USA Motor and Machine on Cleveland, right off Murfreesboro Road. They do the head work for MB of Nashville, the BMW head work for ********, and did mine.
They will take your assembled head, do their work and give it back reassembled just like JH had his guy do. I even learned the 'double-clicking a torque wrench trick' from watching one of their guys.