These sorts of questions always embarrass me, because I'm never sure just what to say. I'm sympathetic with your need to save money, but unfortunately, I can't really help.
Why?
I'm sure, that somewhere, at sometime, one of these design-it-and-build-it-yourself custom pool_spa_thingies have worked out well. But I've never seen that happen. And in any case, I can't really help.
Again, why?
Because what you are doing bears no resemblance to anything I have experience in doing. I've been successful, in the past, at doing one-off projects that require LOTS of time and LOTS of research, but it worked out because I was paid, well not LOTS, but SOME, to do what other people had failed at doing. Regretfully, I just can't spend that kind of time and effort for free. I'm sorry.
It may not have occurred to you, but:
- it's very tricky to pierce thin concrete (septic tank) with PVC and get a water tight penetration;
- that "cement tile blocks" can bear vertical compression loads OK, but not lateral loads;
- that homemade chair lifts are DANGEROUS, and nobody with experience will get anywhere near them;
- and so on.
The bottom line? I wish I could help, but I really can't.
Sorry.
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