Adding the repo was no issue, haven't actually tried the build process yet.
Tho what I have been working on is trimming the image down. So far the compressed download has gone from about 2.2ishGB to 1.7ish. No Wayland, quite a bit of stuff removed, such as thonny, python libs that were related to the RPi development package. Modemmanger was removed, vnc taken out as cups was a dependency, which also takes 2 unneeded services out of the equation. Basically as much as I could find that wasn't really required to run a CNC machine. The image does have 2 desktop environments XFCE which is the default and RPi LXDE , you can swap via logging out and selecting the session from the login screen.
One thing that is annoying is that Linuxcnc appears under 3 different menu headings, whilst it is annoying is doesn't affect operation, this can be fixed by editing the desktop files deep in the system, this could get overwritten via upgrades. I'm considering using a 'hook' that is run when Linuxcnc is upgraded that fixes these annoying menu entries. Another "side project" to jump into.
This feels more like a blog now where I record ideas and changes hahaha

Es ist möglich, dass es einen Fehler beim Abspeichern einer früheren Sitzung gegeben hat:
1. Gib mal im Dateimanager in die Adressenleiste ein: ~/.cache/sessions
2. Verschiebe den gesamten Ordnerinhalt woanders hin
3. Gehe auf Log Out, nimm den Haken bei "Save session for future login"
weg und starte neu

Ohne Gewähr. Ich habe es gerade bei mir getestet, keine Probleme nach dem Neustart. Ansonsten müsste man zuvor verschobene Daten zurückverschieben können.

Sorry I pressed submit to early, the discussion is here
forum.linuxcnc.org/9-installing-linuxcnc...encoraged-to-comment

And I'm quite desperate to have at least one person to test.

Mesa is pretty much the standard, firmware sources are open source, as you have found. Pete is rather open with his hardware designs, there are 7i92 clones on Ali express.
If you really want to have a look at well evolved ecosystem I suggest you check out this topic
forum.linuxcnc.org/18-computer/49142-lin...d-on-fpga-ice40-ecp5
This has evolved into the riocore project.
It may be an idea to contact Ollie and discuss enclosures and such. Whilst he has designed some boards his energies are mainly taken up by the firmware and software side.
So rather than another project from scratch, I honestly think offering your hardware skills would be awesome to take that project to the next level.
I'd even like to offer my help, I've been working on a custom RPi5\4 image based on the RPi build system, rather than another build system, that is basically exactly the same to setup on Raspberry Pi as a standard image.

Ja im Home Ordner ist alles vorhanden. Es wird nur nix angezeigt. Und auch RMB macht nix