I needed a tool holder for my Shapeoko BitZero so I designed this and then added some additional features (bit holders, and wrench holders). Its a touch wide as I wanted to have space for it to be easily set and removed.

I bought 60x13.5x5mm magnets from Amazon (https://www.amazon.com/dp/B0CGTYCXBH?ref=ppx_yo2ov_dt_b_product_details&th=1) and then mounted the holder through the magnet holes.