Can a sliding genioplasty give me this much projection and height? (Photo)

I'm just wondering if a chin implant or sliding genioplasty would be more suitable for my weak chin. Also, one other question: Is my poor neck countouring caused by a weak platysma muscle or something else? I understand the receded chin can contribute to the lack of countouring but it seems very weak, and I've seen others with weak chins but a nice neck countour. I'm around 20% bodyfat if that helps.