Thanks for the reply!
I would love to do purple on the interior, as it's a gorgeous colour (in my opinion) and I think it'll look wicked with the black car. Only issue is finding any sort of lights in purple, especially the dash cluster lights.
I'm also not too sure if the 03 tivos have a red lining inside them, as when the car's off I can see a hint of red where the light shines through, so I think it would probably have to be removed.