I've built them. I'm not much of a carpenter so it was essentially a box. The epoxy really lets on the fumes so caution is advised there. In my case i had a few microleaks that I needed to shore up and I eventually put a liner in one.

On the upside they can be built in any shape you want and I found the wood to be a great insulator as it was super easy to heat the pool and have it retain that heat compared to stock tanks either poly or metal.

It's worth a try but really go heavy on the epoxy to prevent leaks.
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CDieter
'Reason, observation, and experience; the holy trinity of science.'