Uncertain in regards to the resin cockpits and the photo-etch.  I prefer to build my jets in flight.  As for the decals, usually you will need to apply a gloss coat of some kind (Testor's Glosscote, Pledge, or others), apply the decals since they go over better on a gloss finish, then apply another coat of gloss, then a flat coat to tone down the shine.  Other's with more experience can better explain.  I assume you are going for something like this?

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