I would be thrilled to see some of the code for your map system, if you feel like open sourcing it on Github or the like. Even a verbal description of it would be great. It looks really great!
If you wrote code like mine you wouldn't want it seen. I have borrowed freely from others, especially the College of DuPage whose entire site (except satellites) is on github. Their code is well written and documented.
Not meaning to be rude, it sounds like you're going strong and providing a great service. But if you retire in future do you plan on handing down your code and setup to someone?