After watching all your great creations, I decided to build one too.
For starters it will be 2 DOF and as an inspiration I used the post of RacingMat.
Thank you RacingMat.
https://www.x-sim.de/forum/viewtopic.php?t=943
I will be grateful for your advice and ideas - comments and criticism.
So for starters, I got the basic hardware:
And a demonstration of what I already have at home, I think it deserves to be improved.

I will gradually add progress.
Thank you
Board mounting
For connection tests, I am currently printing this cable holder for uno.
Used from this site:
https://pinshape.com/items/25540-3d-printed-arduino-uno-compatible-holder
Wired, The motor position reading test depending on the potentiometer worked well.
Sending data from x-sim to Arduino is not working yet, I have to do research why.

I hope to find out what the problem is soon.
29.8.2021
I watched the tutorial video again.
And now everything seems to be as it should be.
my next step will be to connect the potentiometers and the motor shaft. A rotation test.
If this works, I'll start building the frame soon.