I don't think there are serious errors, otherwise i would not have finished the project. The inconsistencies are mainly in the guide on the site, for example pictures missing or that relate to a previous main board. I think it's a useful tool, if you don't want or you don't have the possibility to connect to the net.
Thanks!
Build guide PDF (uploaded)
yeah, thanks. I did it because i have no internet in my garage ('workshop'!)