RLM 75: tamiya xf24 dk grey + a touch of gunze h56 int. blue to give a bit more blueish tint and a touch of tamiya xf66 lt grey to lighten up + tamiya flat base

RLM 83: gunze h423 + tamiya xf66 to lighten up + tamiya flat base

All freehand of course – right hand is literally aching!