I designed and built this right before Covid when Masa Nitani was teaching his Japanese bowl classes.  Hardly used but fun to design and use.  You will probably want to build a sliding seat like the ones used for shaving horses.  Alternatively, sit on a pad.  It has two carving heads (one needs trimming to fit) and you could create new variations for things like spoon carving, etc.

Dimensions are 4' long and 13" high.