Great write up! I've been looking into this as well but have got no where near as far as you - well done!
I have fitted the M3 front lower arms, including front wishbones, and made a new bracket for the headlight leveling sensor attachment, as you stated it is on the wrong side of the car. Easy done with a hose clamp and small angle bracket.
I am going to slowly work through the proposed upgrades you have listed, so again thanks for this write up!
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