Hello HoHun
IIRC Wellingtons got the self-sealing fuel tanks only after the debacles of 1939 and also the beam mgs, in 39 they had 6 mgs, in nose, ventral and tail twin turrets. The beam mgs replaced the rather useless ventral turret.
Also Ju 88A-4 was a later version, got into service IIRC in mid-1941. In Sept 39 A-1 was just coming into service, 1200 hp Jumo 211B-1 engines and 3 7,92mm MG 15 mgs, 1800-2000kg max bomb load, I'n not absolutely sure on the max bomb load.
Juha