How much do you think it would cost to give an 2003 Audi TT new head lights and a new bumper I wanna custom it?

Also, is there any good sites for customizing audi's?How much do you think it would cost to give an 2003 Audi TT new head lights and a new bumper I wanna custom it?im not sure about the headlights but bumper would range from $750 to $2800 for your ride