I prefer 6. That's more or less what I did with my hand drawn ones. Sometimes the part sticking out was the undersides (WWII fighters), other times it was the uppersides (post war jets). 4 looks intesting too. But please,make them horizontal or vertical, not tilted, so that recolorists can easily mirror elements (or flip them by 180 degrees) without having to reorient them.
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Carlos
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