FWIW here's a comparison between a stock rear pulley with no bearing and a machined pulley powdercoated with bearing installed. Machine work was made by Eagle Machine, thanks to member swampboogiedoug. According to his original post it saves 1 pound and 14 ounces (2 ounces short of 2 pounds) compared before and after under the same conditions, which makes sense considering the lightened one is powdercoated with 3 different colors and also has the bearing installed.
You cant go wrong using your stock wheels for cutting. I sent my front/rear wheels to gorby's and rear pulley to fitzgeraldmotorsport. Both companies can accommodate your creativity and can customized it to your own design.
Front is stock solid wheel from VRSCA and the rear wheel is from allamericanwheel "smoothie". Both contrast-cut and dimpled for weight reduction and design.