I have what looks like a hard punch belly

Thanks for your question. It sounds like you might have a fluid collection (seroma). This is easily treated in the office w/ aspiration in most cases. Have your plastic surgeon look at it. I bet it's an easy fix.
Best of Luck!

Photos would be beneficial for more objective comments but nothing beats having an exam where the area of concern can be evaluated to determine if your concerns are fluid, fat, or muscle as each has a different way to manage. Discuss your concerns with your surgeon and see what options are presented to you as your surgeon should share the same desire for the best outcome possible as you are walking advertising.