Yes, you can openly carry your pistol in your vehicle. Arizona does not restrict carrying in a car. You can OC where ever you please, unless posted otherwise, or in the few restricted areas [federal buildings etc].
as for the full flap holster, as long as the whole holster is in plain sight, i don't see why it would be considered CC. Although i am not sure because i carry in a serpa II holster.
hope this helped.