After reading above, I would see if an above ground spa could be retro-fitted to the hole that was the original spa. My thought, I have a MAXX spa since 2013, not problems and simple repairs if there is a problem. No idea if these is even feasible, but it might be something to consider.
Good luck with your problem.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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