But yes, if you know what you want in a Precision, then a bitsa self-build is the way to go, and often cheaper than buying a whole bass. The below is my keeper instrument, OK I've come close to selling a couple of times due to COVID cash flow issues, but having survived it remains my go to bass. It's like a Fender Custom Shop Tony Franklin Relic, although slightly more resonant than was my original TF (courtesy largely of a VERY good Warmoth neck with perfect ebony board and shallow depth 44mm nut which has made every bass on which it has been installed resonate for longer), Lollar PJ set, Kiogon harness, vintage Gotoh lollipop tuners (the aesthetics of which for some reason I really like), all for around the cost of a used MIM Precision.
As per some of the comments above, basses are a lottery, with bitsas you just keep playing the lottery, albeit with components as opposed to instruments, which is a lot cheaper. It's also far more diagnostic/scientific, because with each switch you're in effect conducting a controlled experiment along the lines "what difference does switching this for this actually make?'. You get there eventually, it's fun but you also, I believe, end up with a bass that you feel closer to as the result.