Here is the best I could do, for any poor soul wandering in the forums afterwards.
3) Bolt body
4) Bolt handle sleeve
15) Cocking piece
17) Firing pin return spring
16) Firing pin
19) Pin 3x18 (mm)
18) Firing pin spring
25) Pin 3x18 (mm)
24) Spring guide / Cocking piece indicator
25) Bolt shroud
1. Put the (17) Firing pin return spring on the (16) Firing pin's tip.
2. Drop this firing pin assembly to the (3) bolt body, preferably with the bolt slightly horizontal so that the spring stays in its place.
3. Now you can look the pin hole in the front is clear. It might require small tweaking forth and back to get it cleared for the (19) Pin 3x18.
-The pin is only there to keep the firing pin from coming backwards, thus in constant tension by the firing pin return spring.
4. Add the (4) Bolt handle sleeve
5. Add the (15) Cocking piece
6. Add the (18) Firing pin spring
7. Put the red (24) Spring guide / Cocking piece indicator into the (25) Bolt shroud.
8. Push the bolt shroud into the bolt body.
You do not necessarily need a vice for this, I just pushed the bolt body against my lower chest with the left thumb.
When the holes align, push the (25) Pin 3x18 inside and finish all the way by tapping it.