So, here go the steps i followed
First of all i aplied a main coat of Dunkelgelb to all the tank:

Then i did like a "mockup" for the chipping

After this, i applied a coat of chipping fluid and painted the camo with olivgrun and rotbraun

(Here you can see the effect of the chipping fluid)

And then i continued painting the details and decided to go for the weathering:

After all that, the result is this:




I hope you like it!