It's all in the club wiki: Rebuilding Struts.

The factory manual is copyrighted, so there is no copy of it in the Wiki. Perhaps if you write to Nissan they will give us permission to reproduce it on the site.

I would say the torque specification is very important. If you torque it too tight, you run the risk of breaking something. If you tighten it too loosely, who knows what will happen.