I think it's fine, especially if the schematic was originally posted with Photobucket. Photobucket seemed determined to wipe half the Internet of information a few years back, and it's still very common to come across threads where 90% of the content is missing due to broken links. Copyright issues really aren't a factor either, just look at how the Klon was de-gooped and plastered all over the guitar world (I don't think there's a single major company that doesn't make a Klon clone, despite the fact it was obvious Bill Fennegan didn't want it copied).