Thank you guys for your interest, it's nice to know that somebody follow my work with this kit :)
Bish- in my opinion russian green instead of the olivegrun is more possible but following this idea I would have to paint green first and then apply the dunkelgelb. I want to try black and white technique on this model so I think that I first will apply the yellow colour.
Btw: I spent some time with the kit and assembled all wheels, each comes from four parts so the process was a little bit time consumpting but the details on finished wheel are worth this time.