Sorry for the delay in responding Andrew, I have been interstate.
Yep I think that carving a spoon on the CNC is a great challenge! I have done a basic double sided cut with the lids for my harmonica boxes, rebate and magnet holes on one side and engraving on the top side. Accurately measuring and drilling of the hold down holes is how I do them. There are a multitude of different ways to ensure the part is located accurately. I haven’t worked in 3d on Fusion yet, would love to learn though. I wish I had more time to do everything!! Hope you are doing well !!