Hello Sita,
Here's another link (with no sources given):
http://www.jagdgeschwader4.de/index....schmitt-bf-110
It gives some armament info, and suggests the E and F have very similar equipment - except for additional armoured glass.
Also, this picture
http:///img-fotki.yandex.ru/get/4408..._e8eed409_orig from yt2 seems to have elements of the G cockpit - could that mean it is an F?