Is this scene genuine?

just found this portrait on the web

http://www.super-mystere.net/aaw/planche/pages/44.htm

it shows what looks like a me-323 being pestered by a RAF B-26
Marauder. So now to bring in question the authenticity of the painting
does anyone here agree that the Marauder in the picture cannot
possibly be able to down that huge transport because :

a: it lacks the forward firing heavy calibre machine guns that some
later models featured

b: Theres no way its defensive armament can possibly hack this craft
down (The ME-323 could actually take quite alot of heavy cannon fire
and still fly home)

any opinions?