Personally, Anything Past a VP does not deserve Vinyl Paint, if you want to do the interior in a newer car, that already has a pretty flash interior, take it in and get done properly.
Sure you could paint things but in a VT I think it'd just go downhill.
Take it into an automotive trimmer/ ulpholsterer and ask him for a quote, then repeat that process of about 2000 times.. With as many as you can find, theres a heap in Street commodore mags etc that show some of their work etc.
Talk to them about your options and find out what you'd be happy with, if you just wanted to do your seats at a starting point, that would make a huge difference. Then you may want to carry on. It's an expensive path if you do it properly, but if you don't put the money into it.. It's going to look cheaper then stock.