The late Peter "Bushy" Robinson won the Duke of Edinborough Trophy, some years ago, with a display case of miniature wood working tools. The ratchet brace was about 30mm overall length, and the chuck, and its ratchet mechanism worked, to hold the miniature auger bits that were part of the rest of the exhibit.
He also made a small plane (barely 25mm long) with a curved foot. The sole plate was dovetailed into the side plates! If it needs saying, it was a functioning tool
Howard