Here is a pic of the engine compartment after the new cowl and lower flashing have been replaced. Note that there was a defect in my flashing as one mounting hole was misplaced; I attached a "dummy" washer and plug with black silicone to seal the hole. Plainly a defect since there was an impression, but no hole, where the hole should have been. No matter, since there are several places where the flashing is secured.
Driver's side wiper arm was a bear to remove--the pressure nut needed to be banged with a tool and rubber mallet and then pried off. It was also difficult to realign the wiper arms properly upon re-installation.
Anyway, here are some "after" pics, and a pic comparing the old cowl flashing to the new one:
'07 335xi 6-spd 4dr, Montego blue
'98 540i 6-spd Sport, Jet Black II
'92 325i 5-spd 4dr, burgundy