Is this lightweight enough to run on a Raspberry Pi?
Absolutely, this should be lightweight enough for even on the very first Raspberry Pi with 256Mb of RAM.
The current requirements for the x86 version don't apply on the raspberry pi, it should take less than 30Mb of RAM idle.
(like the x86 version but after installation)
I could try it on my RPi and a few other exotic stuff... Is there instructions on how to build it and which packages comes with it exactly?
There is no automatic way or scripts to build DellardOS, it's all done manually.
It uses upstream Debian/Devuan, the only custom package is dellardos-system and it can be found here :https://github.com/gameblabla/dellardos_source
Everything else are tweaks :
I removed packages like cron, syslog, gvfs, gnome, network manager,getty, dhclient...
All of that s*** is either removed or in getty's case, disabled.
As alternatives, i'm using SpaceFM with udevil, udhcpc, ceni, custom scripts to configure the settings, lxapperance... you name it.
I'm also disabling ttys, leaving only one and that one is using mingetty rather than getty.
It's focused on having a graphical desktop anyway and gettys take up a lot of memory on old computers.
Once i'm done, i build my ISO with bootcd.
On the raspberry pi, that should be even easier, just use dd to copy the sdcard.
There, now you know how DellardOS is built : i wish i could work on something more ambitous like Sabotage
but still sticking with Xorg.
I will work on a Raspberry Pi 3 image once i figure out VC4 on it.