Grunt is pretty awesome, but adds some overhead. I can try and whip up a PR during the services workweek and you and @Natim can decide if you want to replace Make with Grunt.
I don't know if we have an official Services style guide somewhere, but we try and keep the fxa-auth-server, fxa-content-server, and other services consistent. You're free to tweak the .jscs.json file if you prefer one style over another.