interior paint

I getting ready to paing my 65 barracuda starting with the inside. Do I have to treat the 3 pcs of hard plastic any different than the metal. I've read different things so I'm not sure. The plastic parts hard hard so there shouldn't be a flex problem. Just don't want the paint to come off.
Should I use the same gloss as the exterior or use a satin finish. I know Someone had a post about using gloss and regretting it because of fingerprints on the doors.
Last, My son wants to paint the car hugger orange with white or black stripes. I was looking a little more conservative, but I did buy the car for him.
Do any of you know where I might fing a picture if a hugger orange barracuda so he could get an idea of how it would look? He has a paint sample, but its hard to look at a 2 in square and imagine what it would look like on the car. Thanks for your help as always.
Tommy