I use Dupli-Color Cast Coat Iron darker side covers and Cast Coat Aluminum for the engine, the dark cast color is slightly lighter than the original, but I didn't care and most will not not notice.Amazing build, congratulations!!
Can you share the paint coded that you used to spray the engine and parts with the dark magnesium look? I'm looking to do the same to my 999 next winter but its difficult to find good color match for the gold magnesium look.
The one you used seems to be closer to the magnesium color that Honda normally uses. Ducati seem to have a mag that is closer to gold than bronze.