Its really hard to paint an interior then not damage the paint either putting it back together, or just from general wear and tear... The paint will flake, crack and peel off over time and become quite tacky. Leaving the actualy painted parts as they are looks classy enough, just think about recovering your dash, roof trim etc.. Even 'flocked' dash's look quite good (see Jester?'s thread on his car's build - the dash looks really good that way too)