fwiw, I have put the documentation of these modules online at
https://lua.msys.ch/, our microsite for Lua related stuff. Also on this site you will find a work in progress, the "Lua Integration Guide", where we try to collect and share our experiences while integrating Lua in existing software, write Lua bindings to existing libraries etc. We put it online in the hope it is helpful for some folks. It's really work in progress, so check for updates from time to time (the timestamp of the last update is in the footer of the guide).