A GitHub repository for the (b)log-In system is now live which includes basic installation and usage instructions in the readme.
I changed my mind.
I'm not sure if this will be just a one-time thing or whether I will keep it up to date with any changes. I don't necessarily expect anyone else to use it (it is very specific to my needs) but I have had a number of people ask about how I did certain things so thought I might as well put it out there. If you spot any issues or just have questions feel free to raise an issue, ask here or drop me a mail – colin @ this domain.