Here' an interesting site.
Luftwaffe Resource Center, that mentions a
Waffentraeger (Weapons Carrier) model that had 11-20mm MG 151 cannon and 4-13mm MG 131 Machine Guns, as well as extra armor and bullet proof glass. It goes on to point out that this version was discontinued in favor of providing escort fighters.
Wiki points out that the standard crew was 5 (two pilots, two engineers and a radio operator), and that later models had two additional gunners in turrets on the wings.
World War 2 Aircraft reports that the standard armament, with the two wing turrets, was one 20 mm (0.79 in) MG FF cannon in each of two turrets (one on each wing), two 13 mm (0.51 in) machine-guns in nose doors and
five 13 mm machine-guns firing from the flight deck.
h-m-m-m-m-m..... 5 guns on the flight deck..... two pilots....
when the lead starts flying.....
who's flying the airplane?????
(...boy, I'll bet there was a lot of yellin' goin' on up there!...)
..interesting...
-whatever
-Lou