For the weight you are perfect with the AP, for sure. You will have to trim it on the height to get it your size. It can definitely be Centurion, the only modification to do is the notch on the sides, very easy to do.
For the snaps positions, there is no perfect way to do it. In the movies snaps were not used. You have to find the best way for you, check the EIB and Centurion threads, they are very helpful. What is not visible is at your discretion.
I used snaps on mine and it's really good and easy to do, not visible at all on the outside.