This type of semi-buried pool would work if the rest of your yard was down hill so that you could install a drain and have a hose run the water down to a garden. If you had a flat yard, I think you would need a raised pool to be able to drain it in to your garden.
The idea of using a stock-watering tank for a DIY hot tub project has been around for a long time, but all of the ones I’d seen were pretty unattractive. I wanted a setup that was nice-looking, easy to use and economical. My hot tub dreams came together when I discovered a wood-fired spa stove made in Japan by a company called Chofu and imported by Island Hot Tub Co. Depending on how the soaking area is customized, the setup I’ve designed can cost less than $1,000.