To access the front panel, remove these three screws on each side with a #2 philips head screwdriver

You can then pull the frame wide on each side so that the bottom panel comes off.

You see the main power switch, the Bourns 10-turn 1K pot which controls the current set point, the smaller Bourns pot which sets the overvoltage crowbar.

More interesting is the board underneath/behind the voltage selector. This board is populated with lots of ultra high precision resistors, including 0.01% tolerance, 0.025% tolerance and 0.1% tolerance resistors. All are either 1ppm or 2ppm temp coeff. These are ultra high precision even by todays standards.