Painting the interior pieces is actually pretty easy, and you can get it any color you want.
As for stereo, it will be a little trickier because you have the convertible. but its definitely do'able and you can get a lot of help here.
As for tint, it is illegal to tint the front windows here as well, but everyone does it and as long is it isn't too dark, you dont have a problem with the cops. Although, i'm not sure if they have inspections in Jersey or not..
You can check out my gallery to see my stereo setup
2006 G6 GT
Mods so far: Black arrow overlays, Chrome recessed grilles, Blue LED license plate light, Blue LED reverse lights, Smoked tails, 20% Tint all around, Red led's for the interior, White led dome and map lights.
Sound System: 4 Infinity Kappa component speakers, 2 Amps (950w total) and 2 10" Kenwood KFC subwoofers, 7" touch screen Pioneer DVD
Performance: Mobile 1 oil, Mobile 1 oil filter