Scale Model Group Build, anyone?

Lert: 1/16 scale StuG III G Early:         Used a very quick-and-dirty method of weathering:   1) Do basic paint job / camouflage 2) Drybrush gunmetal on the edges that would see wear and tear 3) Very lightly drubrush rust color over same 4) Apply black wash, lightly on top, more heavily the lower on the vehicle because more dirty 5) Apply sepia wash over the black wash, lightly on top, more heavily the lower on the vehicle because more dirty   Oh, I've only now noticed that I forgot to weather / apply wash to the spare roadwheels. Well, this shows the contrast between unweathered and weathered. Off to apply a drybrush and wash to the spare roadwheels ...