Chevy engine red is a very close match to the stripes for either the decals or the snap kit. The Batmobile was severely mistreated during the run of the show. More often than not you'll see it looking "smeary" in the cave, not outside. The reason for this is the famous Bat-cave turntable...which didn't exist. The car would be placed on a platform with a central pivot. The car would then be "turned" by crewmen from the set.
You are correct about the door bats. In the first season the bats were held in place by flush set screws. Second season to facilitate easy replacement they used magnetic sign material for a while and finally went to printed decals.