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1. see below
2. yes
3. yes
About 1, it would be much better to have some pictures to be able to answer exactly, but in general, LinuxCNC is very flexible and quite easy to make it do pretty much everything within reason.
I am sure Todd has a machine with 4 of Z axis, just not sure if independent, but again sure it should be possible.
If you wander a bit through the "show your stuff" section of the forum, pretty quickly you can find all types of machines controlled by it, personally i have from small "scratcher" machines for pictures on granite/stone/glass to huge industrial machines (plasma, mills, lathes) and some welding robots and small dental 4 axis clear aligner cutter.
Plenty of pictures and videos there.

Thanks

T470 with FHD 120Hz touchscreen
Y370 laptop/tablet/pen/FHD 120Hz touchscreen
X1 Yoga gen1 laptop/tablet/FHD 120Hz touchscreen
Plain ol X240 seems OK also, had 2, still have one in active use

Notice the touchscreen and VSync frequency, those are very important as they are top of that line, meaning other versions might or might not be good latency vise.
The link i posted above has all the info and videos of them in use plasma cutting, so no interference issues with touchscreen.

"old Lenovo laptops at 100-200 Euro a piece"
Tommy,
could you kindly name a few of them?
I could test a T440p, T460p for example.
Greez
chris

PS: these do NOT have touch screens, though

I don't think so, those appear to have analog sinusoidal outputs so
require an interpolator (that is, they are not standard quadrature encoders)

Please tell me, can I use encoders from the Mitutoyo AT111-100F або AT111-200S series?

Try it out.This should draw the tool, detect your machine's workspace, and correctly map the A-axis rotation.Copy the entire directory to "/usr/share/qtvcp/panels" and run "qtvcp machine-test"

DANNNNGGGGGGG. This is so impresive. The arc cuts are actually so clean. Wish I had something like this in my FSAE group.

Thanks for being a good sport haha.

Yeah we had to do some tricky stuff and use the m64 and m65 commands for torch on and off in the g-code. Also had to manually add in the pauses before and after cutting to ensure a good arc and full cut had been made.

There's some other odd stuff going on in the background too. The machine thinks the rotary axis is linear and 1 inch of travel is actually 1 rotation. We made a post processor for sheetcam that scales any unwrapped tube profile to be within 1inch as well to correspond to the 1 revolution needed. Lots of strange stuff happening lol.

I am pretty sure it did till 2.7 as i used it on every machine, and we had power outages daily back then.
No idea now as we have no power outages so i do not use it anymore.

YOOOOOOOOO. This is so well done

Who? Why? Where? When?
Nicely done and thanks for reporting back and for proving everything is possible with LinuxCNC.

I think it is something the Rpi does at regular intervals, drops the network interface for some reason.
Inspired by some googling can you search through the syslog to see if you find why eth0 is reset?

Edit. Another idea is to configure NO ip address on the interface.
Maybe it can prevent the os from doing ip-related things to the interface.

They told me it wasn't possible! They doubted me! Mwahahahaha!!

Functional 2-axis tube cutter using no Z-axis on QTPlasmaC:
 

 

I've tried POSITION_FILE, but it can only save the position when linuxcnc is closed normally. When my PC is suddenly turned off, such as due to a power outage or linuxcnc error, POSITION_FILE doesn't save the last position of the machine movement.