Building and configuring your own unicycle is fun, for sure, I’ve had multiple custom 19" unis, with my own paint jobs, etc. Really fun projects. But since time has recently become a lot more scarce, I only focus on parts that matter for riding. I build myself a “Hugo strut” similar to this: Scheibenbremen, scheiben, beläge - #57 by Charly.Oldie
and a DIY brake extension piece, both are not pretty, and could be optimised, but they work, so I leave them.
What I am trying to get to is: If you have the time and money to spend on making your unicycle exactly the way you want, go ahead, it might be a fun experience. But it’s definetely not necessary to become better or most importantly, and it usually is not “worth” the time you spend on it if you look at the progress you could have made in the same period of time. Riding a uni that is precisely the way you want it to be is definetely fun though.