Instead of buying expensive furniture and experiment on costly home renovation, why don't you consider installing an indoor or home sauna? It's one of the best decisions you'll make if you have the money and resources to do it.
Besides the aesthetic features, saunas can do a lot in improving your health without leaving your home. There are a variety of options to installing a home sauna. You'll find a list of credible people selling saunas.
Indoor saunas have flat ceiling panels instead of a roof. There are precut sauna packages that include all the add-ons such as heater, lights door, flooring and water dipper.
There's also a pre-built sauna that will save you time from constructing. The other type is portable or "knockdown" sauna.You could also opt for infrared sauna which is the most modern today.
It's very important to choose the right material. Avoid lumber that is 1/2 inch as sauna's standard thickness is 1 inch.