BF109 - Can't we just have the gunsight in the middle?

[SEE]

I managed to get up to the cockpit of a Bf109E-3 last weekend. I read they were tight but I have to say I was suprised at just how tight!

Looking inside it (from no more than a foot away) my perception was that I would hardly have to move my head to see through the sight. The BF's are extremely nice up close and the first time I have seen them in flight - super ac and one I must fly (in game) more regularly.