Having successfully disassembled your Glock frame and slide, building a custom Glock from scratch is simply a matter of reassembling the pistol (one key component at a time) and taking the time to replace the OEM parts with the aftermarket ones of your choosing.https://www.shootingillustrated.com/articles/2020/1/12/glock-diy-guide-assembling-a-pistol-frame/