I'm not an expert on such builds, but i have messed around with the same ideas, and from what i see here you are certainly on the right track. Congrats! But, i believe the experts will tell you "it's all about bypass". Your Buffout plan with Nuka Cola and AG 10 is perfect though, but i would make PE 9 so cigs boosts it to 10, and put that point into IN for higher FA/Doc maybe (or maybe ST like Max said above).
Also...for snipers who can do aimed shots, it's important to get the Right Between the Eyes perk. Your guy has Finesse though which means you won't be doing targeted shots, but i'm sure you know that.
Question: which weapon do you plan to use with this guy?