[Flojo]

first of all: congrats!
I still have that before me.

1. I cant say.

2. the cross bar: better replace it with a used but good one and then maybe weld some stiffening in that area (a stiffened racing cross bar may be too expensive for the "job").

3. the airbox seems to have been damaged due to classic "blow up".
Is there a pop-off valve mounted (inside, belof airfilter)?

4. there should be a hose stuck to it, going to the airbox backside, imho to the extra airflow regulator (German: Zusatzluftschieber).

5. + 6. cannot say, sorry.