I wrote a single file CMS a couple years ago, similarly out of necessity. It might be a place to start. Build off of it as you need to. https://github.com/gelf

I wrote a single file CMS a couple years ago, similarly out of necessity. It might be a place to start. Build off of it as you need to. https://github.com/gelform/GelCMS https://github.com/gelform/GelCMS