I have done a couple hundred fender rolls for the german look tuning boys! It was very popular here a few years back . Its possible to get about 15-20mm with out painting if the car has original paint! sheet metal has to be over 70 degrees Celsius or the paint will crack.If it is re painted you never know what happens its a gamble!! To just roll up the inner lip is easy and often helps more than you think. I have never done it on a Pantera but i think it should be easy to get the hole fender to move outward a bit at the same time, Because it has no inner fender as normal cars. just find someone that is good on it.