If the guitar started as a Guitar Kit World kit, it is eligible. Everything past that is open.
Upgrades do not disqualify anything. Swapped the pickups, the bridge, the tuners, the whole loom? Still eligible. We would rather see what you changed.
You do not have to have bought the kit. If it was a gift, you can enter it.
You do not have to be the player. If you build but do not play, hand it to a friend who does and film that. The build is half the score either way.
Any kit, any round. A guitar finished years ago is still eligible, and you can enter more than one build.
Guitar Kit World has been shipping DIY kits since 2013, to builders in over 100 countries. Whatever you built, somebody here has built one like it.