I looked at some of the pictures and captions, but did not study everything closely.
I have two comments. Just being honest, I do see this as a bit of a sacrilidge, but I also see this as a very well done engine swap.
I've done a few engine swaps in the past, but they were in much simpler days when you didn't need to incorporate all the electronics and there were much larger engine compartments to work with.
I would probably doing more of this kind of thing, although not with a Benz, if my welding skills were better.