Distrowatch has it's own search, with plenty of categories & window managers to filter by, tried there? I looked for any arch based Fluxbox DE Linuxes and it told me these two:
- BlackArch Linux
- BlackArch Linux is an Arch Linux-based distribution designed for penetration testers and security researchers. It is supplied as a live DVD image that comes with several lightweight window managers, including Fluxbox, Openbox, Awesome and spectrwm. It ships with over a thousand specialist tools for penetration testing and forensic analysis.
- Parabola GNU/Linux-libre
- Parabola GNU/Linux-libre is an unofficial "libre" variant of Arch Linux. It aims to provide a fully free (as in freedom) distribution based on the packages of the Arch Linux project, with packages optimised for i686 and x86_64 processors. The goal is to give the users complete control over their systems with 100% "libre" software. Parabola GNU/Linux-libre is listed by the Free Software Foundation (FSF) as a fully free software distribution. Besides a standard installation CD image, the project also provides a live/rescue DVD image with MATE as the default desktop environment.
But since you'll be installing, you can customize any Linux install to:
- Use whatever file manager & window manager you prefer.
- You actually have to specify
noauto in the fstab to stop auto-mounting on boot or
mount -a, so automount shouldn't be hard to set up.
- Root login is rarely recommended, but shouldn't be hard to set up either. Though using a permissible
sudo setup to not ask for a password would be good.
Systemd I'm not so sure, but a search for arch linux replace systemd has lots of promising results, like:
Could just go for the "most popular" arch based on there, Manjaro Linux and customize it, if you need a popular one that might have more support & a bigger community for help...