This method also allows you to make very large bowls that would be impossible to do on your typical lathe.
People's reaction is typically "How do you make these?" and "Do you sell these?". I'll show you how I make them; but no, I do not sell the bowls: I just make them for relatives and friends.
Step 1: Materials and Tools
Wood Boards - I use red oak and maple in this example: 3/4" by 2-3/8" by 6' linear ft for the sides; and 3/4" by 4" by about 3' linear ft for the bottoms (resawed and planed to 3/8" or less thickness).
MDF Board - 11" by 22" for the jig
A Few Nails - 6d and 8d
Sandpaper - 100, 150, 220, and 320 grid
Danish Oil Finish or similar
Bandsaw - 1/8" or 1/4" blade
Additional Useful Tools if Available:
Bench Top Belt Sander and/or Spindle Sander
Router or Router Table