Great DIY and subing for future reference!
I do have one correction...although it does not directly contribute to the DIY. The picture for the cover under the engine is wrong, that pic is for an aggregate protective plate. The correct cover that is held on by 7 screws is called an Engine Screening Cover.
Important if/when you order a new engine screening cover.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red