The component layout looks like this:
Components not mentioned on the board are: transformer L1, bridge rectifier G2, capacitor C5, C2 and diode D1. These are mounted in the cabinet. The positive terminal of C5 is connected to pin VSIN on the board, and its negative terminal is connected to the VSGND pin. C2 and D1 are directly soldered to the output terminals.
The 20V winding of the transformer is connected to the AC20A and AC20B pins on the PCB.
Transistor T6, potmeters P1 and P2, switch SW1 and LED D1 are mentioned on the PCB, but not mounted on it. I mounted T6 on the metal back pannel of the cabinet (electrically insulated!) and used three pieces of wire to connect it to the PCB. The other components are mounted on the front panel.
Pins OUT and GND are the output terminals of the power supply. FB+ and FBGND are the feedback pins. I soldered them directly to the OUT and GND terminals.
It is highly recommended to use IC sockets for U1 and U2: soldering out a defective chip can be quite a pain.
When you're carefull not to mount diodes and electro's the other way around, you should have no problems on this project. And if it doesn't work immediately, you have enough knowledge to deduce the problem!
A picture of the power supply from one of the course members.