Nice job! AMG280.
I attempted to replace time chain on my 92 400E last summer, I bought all the parts, chain, tensioner and all kinds of guide rails. I was only able to remove the driver side cam cover, I then spent nearly a whole day trying to remove passenger side cam cover, the Allen bolt that was close to the firewall was impossible for me to remove, I think I finally stripped it, and had to give it up. Reading your post, I feel lucky that I gave it up.
I will have to send it to a mechanic this summer, this will the first time someone else touch my 400E, there is something you can't do all by yourself.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.