[Hajo]

Uh...I don't know....What you prefer?

A closed cockpit,which will make it very hot inside when in Mediterrenean,or closed on the eastern front,which will made it very cosy and confortable inside while outside is -40 degrees Celsius?

IMHO, it will be more realistic with the closed gunner canopy. At least, all Bf110 I've seen both on foto & video were with closed gunner canopy 8) .