Assumeing you have an airbrush / spraygun , what they say is use say a 1/4 inch spacer under the spraying templates , so theyre packed up .
Could lead to overspray , so requires a bit of forethought .
Alternately , airbrushing the outline / edges FIRST ; maybe following a offset template edge . As in cutting edge back 1/2 in if accuracys your thing , Then masking & spraying the rest .
Some of the late FW had PURPLE , brown & green camoflage . The underside blue is quite a pale colour .
Looking up the I P M S Site or other plastic nutters should get a lot of good info on tecniques & schemes .