I teach the Leatherworking Merit Badge and I allow the scouts to make anything they want as long as it is a tripod stool. This makes it much easier to know my costs upfront. They can make whatever design on the stool, use rivets, sew, transfer patterns and learn edge detail. Best part is that they all bring these on campouts, save room in the trailer and because most put their names on the stool they know which is theirs.
Tribolts sold at Tandy, legs made from dowels from Home Depot, I buy a discount 3/4 leather Veg tan side for around $70. I make straps to go around the legs with scraps.