I built a custom stick out of 3mm MDF and a 2mm thick acrylic panel.
It measures roughly the same in both width and length as a TKL keyboard.
The stick is light but doesn’t move around on my lap, (where I use it from).
Only thing I messed up a little is drilling the acrylic, which you can see slightly under some buttons.
I just wanted to leave this here because virtually all of the posts online suggest much sturdier/thicker builds and, in my experience so far, this works just fine if you are not a complete savage
Hopefully this will encourage people who may not have so many tools to build lighter but still usable sticks.