Speak to member NJ 1161 - he built an E92 M3 replica based on a 335d and his work was fantastic. He's also finalising his build on a genuine M3 coup which is breathtaking. He is undoubtedly one of the finest modders this site has and will be a wealth of knowledge. Check out his threads an make contact, he'll be a big help.
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.