That also crossed my mind. My original panels (challenger) were in pretty bad shape and a I also thought that it could be a decent idea to cover them with vinyl. I was thinking of doing it by myself but there are some bit troublesome contours on the challenger panel which could lead into problems. One of them is that deep notch that goes horizontally over the panel. Since then I have tossed the idea and bought set of panels that are in better cond. I will need to redye those though.
So I have no idea about the price but I think that it should be doable but still needs some work and probably knowledge. I've never glued vinyl on anything yet.