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Tiger,
Not sure i understood everything.
Do you mean you could not paint your model ?
I sure donnot think so, you CAN.
And sure it'll be more than correct.
Wurger gave you a great solution.
Weiße 3 is not a tricky scheme indeed, and a pure beauty in my opinion..
No airbrush problem, ventral shades can easily be done using almost dry straight/slight slashed cutted handbrush.
You can train on any plastic card 'till at ease.
Let us know pls, have fun.