easy way to ground the pot and chasis
I've found an easy way to ground the pot and chasis of the CTH in the small bom case.
What you need is a 1/8" 4-40 screw with nut (and preferably lock washer), and 2 ring terminals: one with a 1/4" hole, and one with a number 4 screw hole.
The 1/4" ring terminal goes between the pot and front panel as shown. Note that the 1/4" ring terminal needs to be screwed on to the shaft like a nut, because it is not quite large enough to just slide over.
You have a wire that goes from the pot ring terminal to the other end of the board. Here it is clamped into the other ring terminal along with a shorter wire that is soldered to the SG (signal ground) hole on the board.
This ring terminal is bolted to the chassis and you're done. This configuration still makes it very easy to open and close the case.