The term "build" seems to be used quite loosely when it comes to guitars. It seems it could mean everything from sourcing and assembling all the parts to make a guitar, to getting a kit that has all of the parts to assemble and finish, to forming all of the wood parts out of raw lumber and winding your own pickups.
I am not minimizing what it takes to collect all the parts and assemble a quality guitar. There is certainly more thought, personalization, skill, effort, and personal satisfaction involved than just going into a store and buying a guitar off the wall. But to call that "building" a guitar, seems to me to be about the same as saying you "built" a puzzle. No, you didn't build it, you assembled it.
I always feel compelled to disclose what parts of the guitars I've built myself from those I purchased or sourced. For instance, 'I made the body, but got the neck off another guitar and reshaped the headstock,' or 'I carved the neck, installed the truss rod and frets myself, but used a pre-slotted fretboard from Stew-Mac.'
To me, if you didn't actually create at least some of the pieces yourself, how can you really say you built it?