That's a beauty! Cottonmouths are one of the few Agkistrodons that I've never kept but I love them. I kept and bred Cantils and Copperheads back when I used to keep venomous (before my daughter was born
I thought you might appreciate this unusual cottonmouth I found while field herping in the FL panhandle several years ago. It was an adult (approx 3 foot) but still had very visible banding and light coloration. It almost looked hypomelanistic except for the black tail. It was definitely a conanti based on where it was found.