Nick: I have three AK40, it is very easy remuve the chassis from the box.
1.- Remove the knob for the sintony.
2.- Remove 4 ó 6 screws, 2 ó 3 at left of the first variable capacitor and another 2 ó 3 al rigth side of the secord audio tranformer, the small black cilinder.
3.- Remove the cover of the power supply and remove all nuts from the connector board of the power wires.
4.- Remove the nut of the power swith located under the volume knob.
5.- Remove the 2 screws fron the antenna and grond connector.
The chassis is free, you do not need to remove the knob control.
Let me know if this help to you.
Jorge
You welcome. Jorge