After third coat of 'Dark Sand',

rubber black for window edges,

second coat of Mr Hobby 'Sandy Brown' for roof mechanism,

touch ups with all the above and Mr Hobby 'Pale Brown' interior (what I'm saying was the orginal color of Topo with gloss black fenders),

then a wash for baby in AK 'Light Brown for Desert Yellow.'

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Next up: pin wash to punch up details. 

Then weathering and highlights.

Then attach roof material.