just a few things to consider , how big ? one person ? or more ? Would this be something you will use in the winter ? and how elaborate would you want it ? will the heat source be electric or from other sources ? I thought about building one from landscape timbers to resemble a cabin but didn't want the treated wood around me, teak and or locust makes a good wood for the seats and interior walls as well as cedar and may last longer however it is by no means inexpensive , at one time you could get the heating elements with the lava rock and a water bucket all in one but they again were not cheap .if this will be outside the better insulated it is the less fuel it will use in the winter . at one time there was a kit you could buy that allowed the install in the bathroom or extra closet or basement in you home , They might still be a kit out there ? if it is inside the home be sure to use the proper building materials and water proof drywall behind the stall walls along with electrical protection for any outlets ,lights and controls ? if you live in town wood may not be a option for the heat source ? you may have visitors every time you light the fire lol , good luck .
Hobbyman2 Favorite Quote: "If a man does his best, what else is there?"
- General George S. Patton (1885-1945)