This is my shell bowl that I designed and made on my CNC machine. You can download it for free from here. Included in the download is the Fusion 360 archive (.f3d) and an export of the model as an STL file.
Watch this video to see how to make it: https://www.youtube.com/watch?v=ShHz8HjCyqw
And, I also highly recommend my basic tutorial playlist: https://www.youtube.com/playlist?list=PLqbMbcTzG1Fc0jLrHUR7csE7wf2sZm1oV