I've seen that web site before, while it looks like a good reference, I prefer to use direct resources, IE: BATF, USPS, etc. instead of a 3rd party resource when it comes to a serious subject like shipping firearms where making a mistake could mean bad news for me, the old adage "Ignorance of the law is no excuse", comes to mind. As far as posting it as a permanent reference, I would leave that up to Graybeard's discretion.
Tim