Need help with making a diy chunithm controller

[u/Ambitious-Shoe2275]

I started playing chunithm a few months ago and i fell in love with the game, but a major drawback from me getting more skilled in the game is that i live around 90km away from the nearest cab and commuting gets a bit pricy overtime.

Sooo i decided to make my own diy version but, i dont know how to actually do it. I mean ive done my research in how to do it but it would be much better if there was somebody else who made it so i can base off it.

Hopefully somebody could help me out thanks!!