Clamp I used, not perfect but does the job.
The wood is held together with 4 70mm screws and 2 metal angles.
At 0:53, I use 6D Mark II with 24-75 lens at 24mm. Legs are barely visible, and them I move to ~30mm and they're gone.
There's a silly highlight on the sides, maybe I'll do something about it. You could shorten the LED strip and not run it all the way to the bottom to avoid this.
Another nice touch would be a safety string for the camera to make sure it doesn't fall down if something goes wrong. Yet to find a good solution for this.