Being a fan of Simracing, I decided to create a button box.

You will find a front face without holes to make what you want and a version with 8 holes for 6 momentary switch and 2 toggle Switch

There are several possibilities such as using an Arduino (like the micro) or using an USB encoder. The USB encoder (version that I chose) works on : -American Truck Simulator -Euro Truck Simulator -F1 2018 -F1 2020 -F1 2021 -F1 22

It does not work on: -Assetto Corsa (I didn't try with anything else)

What you need: USB Encoder

I use this Countersunk Head M3 screw 14mm you also need 4 M3 nuts

The Momentary switch in the photo are these

And the Toggle Switches are these

For a better finish I recommend this (12mm)

Also using these small anti slip parts can be a good addition (something like 8x1.5mm)

Feel free to suggest improvements or ask me questions.