This is a very cool diy wood fired hot tub with sauna. Shows how they took a Rubbermaid stock tank and a chofu heater to make the hot tub then built a small sauna room with a small wood stove and even repurposed an old door to use for it.
An old claw foot bathtub with a plywood cover serves as the dunk tank. This is pure genius and a whole lot of savings that can be used by pretty much anyone with the space to have a hot tub, sauna and dunk tub. Very neat. Check out all the pictures on Tiny Gogo.