Questions about the Bf 109 E gun sight

[canonne]

Hi,
I have some questions concerning these 2 enlarged parts of 2 photos. I was helped via long time ago by famous Lemb (http://www.luftwaffe-experten.org/forums/) but unfortunately I lost information included in responses.
It seems these shots are showing part of a same Bf109 E-7 (?) :

Photo A (and B) :
1) Part 1 is the : armored cockpit.
Where or/and when did this part was added : in factory or on general maintenance units or directly on the field units by mechanics ?

Photo B :

2) Part 2 : seems to be a tool (?) : if so a screwdriver ?

3) Part 3 : removable viewfinder (a word for camera probably not for weapon … sorry).

4) Did wartime reports show this system ?

5) It seems these photos are showing an a/c belonging to a training unit :
So what are the exact German words wich could appear in Flugbuchen speaking about : strafings/ground attack pratices ? or so ...

Thank you for all your contribution !
Philippe