What a nice setup and you hide it for this much time. I also planed to swap this engine.
Did you get this engine from front cut? Engine & ECU is out from which variant/model? From where you bought this engine? Swap & wiring was done from where?
You used C60 6-speed manual transmission, can you share a picture of the gear stick because in normal a car have 5-speed manual gear stick. Which gear stick and cables you used in your setup? I think you can understand what I am trying to say.
And why are you selling such a good setup?