I used 'Testors' "Model Masters" british racing green for the exterior. Then I followed up with 2 coats of Gloss coat. It's difficult to show the green, metallic, paint in the pics. I primered the exterior first with a "flat" green. Also, the 1st thing I do is wash the model in 'Dawn' to remove the oils and then I allow it to air dry.Nice job what kind of paint you use on exterior? I thought about getting a 1st gen and putting the drivetrain and wheels of the 5th on the 1st but I like that I might try one with a Z28 or SS next. Trying to find SS decals without having to kit raid has been a PITA.