I have been plunging for a while with an inflatable tub and a subpar chiller. A friend of mine introduced me to the DIY coldplunge a few months ago. We built his first, then we build mine with minor changes. I used 1x8 cedar instead of the T-111. Both look great and both perform perfectly. The plans make it extremely easy for people of all levels. These cold plunges are the best out there (imo) and save you loads of money.