I built sequential shifter by following instructions from @donnycrash8954
Here is the link of his video: • BUILD THIS LOADCELL HANDBRAKE | SIM RACING
You can find more details in a description of his video.
It is built from 3mm thick aluminium (waterjet cut).
I had to improvise a bit with components I used in a build because some parts I could not find in hardware stores here in Serbia, so I ordered a lot from Aliexpress and Arduino code (I built a sequential shifter as well, so instead of using 2 Arduino Pro Micro boards I am using one for both, shifter and handbrake, here is the link to my video about the shifter • #DIY #simracing - Build a sequential shift... .
If you need links for components from Aliexpress, adjusted Arduino code or anything else, please feel free to ask in a comments below.