Aftermarket Sunroof

How rare is the car? It shouldn't be too hard to find a Challenger donor car with a decent roof section, but, a Barracuda will be a bit tougher.. If you go with a full roof cut at the factory seams, it's going to be expensive to get done. Just a patch panel welded in around the sunroof opening would be half that or less depending on inner braces and degree of body work finish. Hard to say what the actual cost would be. Every shop has their own prices and degree of expertise. If you can't live with the existing sunroof, I'd locate a donor roof and get some estimates before buying the car.