RE: BT Bf109E-4
primered the blisters today.
pic 2-3: after priming, i added an air intake scoop. for this i cut a plastic spoon in half and and added a flange with some aluminum flashing. the plastic spoon was almost the exact shape of the intake.
pic 4-5: also, added some radiator detail with aluminum tape. the prototype has a wide flange coming from the radiator unit itself and this what the tape simulates.