Cut and Crown Marlin 336

How much should I expect to pay to have 3 in taken off a Marlin 336 (and done correctly)? Anything in particular I should be concerned about?

Google 'Brockman's Rifles'. Last I knew (a couple months ago), He was charging $110.00 to cut, crown, and shorten the mag tube. I've not used him (just looked into it, still need a rifle I want to send him), but he comes well reccommended. He offers full levergun custom packages (and apparently bolt action services, too, but who cares).