You only need to rebuild Luin in the NG+ speed runs. Go to guides and go to the symphonia hub if you require even further help or an in depth guide as well as practice files and speed run ready NG+ files. Hope this helps :3

Sorry but those forums are not Gamefaqs or anything, they are meant for speedrun related stuff ._.

You could also have simply posted in your previous thread. Would have been easier. x)

I will still reply: repairing Luin is not mandatory for a casual playthrough. Nearly everyone skip it the 1st time. But then, when you do a New Game +, it becomes interesting and funny to repair it. And of course if you want to do 100% it becomes mandatory.But you need multiple New Game + for completing 100%.