Many thanks for your inspiring comments! Unfortunately I was too sloppy to take pictures for a step to step docu. Sorry, next time!

The wear and tear was done with the hairspray methode and chipping and and the streaks with oil colours.
Kiel (city in north germany) is here just around the corner and the saw license plates whith the letters KI LL often. Quite fitting for zombie disposal.
In theory most toy cars I use are 1/43 and too big for 28mm Tabletop, but in on the table they look half decent. This VW is also not in Scale and according the imprint the scale is 1/40 (!!!), ... but it looks OK and was a steal at that price.

... and it is all about style, maybe my next conversion will be a realistic bad-ass-all-terrain vehicle.