first off the locking nut is only finger tight as the sperzel tuners are locking, but that is what came with the neck. the cardboard part came from the model, there is no cardboard in the final guitar. you can check out the build here
http://www.unofficialwarmoth.com/index.php?topic=6772.0
http://www.unofficialwarmoth.com/index.php?topic=7418.0
http://www.unofficialwarmoth.com/index.php?topic=7683.0