All it takes is a five minute perusal of the build issues here on TDPRi to see that solving problems is the difference between an amateur and a pro.There’s nothing in that list above that won’t have been encountered before, and won’t have been solved before. Especially with partscasters - essentially parts being assembled. I’d understand a bit more if someone was struggling to build a strat body out of noodles, or concrete, but even those two have been done and there’s information out there.
I’m not trying to dismiss years of experience, nor am I trying to claim that any build I make is as good as a CS. However I don’t for one minute believe that we’re at the cutting edge of guitar technology, nor do I think that there are unsolvable problems requiring years of experience when assembling partscasters.
building a guitar from scratch out of solid chunks of wood - now that’s a different ball game, but then again from my understanding that isn’t a partscaster. In any case, even if one is attempting a build from scratch, it will have been done before by someone, and guarantee there will be info somewhere on whatever wood (no matter how exotic) or whatever tremolo or scale length chosen or whatever other combination.
I wouldn't trust an amateur to do a set up let alone a complete build.