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I have seen this on Facebook before, too... It is quite clever

Everytimes things seem easier , for you , coders , compiling included , tried once compiling linuxcnc , 12 years ago,gave up ,
as i always found some up-to-date debs and managed with missing dependencies .
No non lts option ? hmm , i guess where armbian step aside ''standard support'' is the broken pcie of first opi4.
I did not test the whole compatibilities yet , ethernet is one and could i end up with problem ,does log error for the missing NPU (weird it's on b ?! ).
May i suggest , dont do upgrade , or know what you choose to with your rt image ,as i did broke repo & reinstall,quick fix .
Tar.xz does wonders , 4.7gb to 1 ,amazing .
isol 2-5 , i'll check , tested a lots of combinations , lazy me , did not note them ...
Armbian-config use to have cpu settings options ? it's gone?

75 pages of build thread and I can't find what I want so this will have to do.
forum.linuxcnc.org/show-your-stuff/32029...ild?start=310#124765

I suggest you slats are only mounted each side and in the middle. Then you can put a bend in them and have the slat ends pushed against the frame which stiffens them up so they don't wobble. I copied this design from a swiftcut machine on the show room floor.
The slots holding the slats here are very  shallow, maybe only 10-15mm laser cut into some 16mm strips
 

Try setting isolcpus=1
I use grub-customizer to do this. It is installed on the linuxcnc ISO's