Step 1: Getting the components together
It needs a regulated power supply of 3.3 volts, supplied by a three terminal low dropout regulator. Microchip make one, called the MCP1700T-3302E/TT though the actual chip is a tiny thing. Look carefully, you might just be able to identify it.
The other components were salvaged from various sources. The 6 MHz Crystal came from a Television set, where it was clocking the remote control microcontroller. The capacitors and resistors were unsoldered from various boards from junked equipment.
Step 2: The circuit board
The only contact the circuit board had with any modern electronics was when it was photographed so that its picture could be displayed in this web site.
A piece of copper clad board was cleaned, and covered with etch resist ( I used a permanent marker pen ) and the integrated circuit clamped over it with alligator clips.
A needle was used to score fine lines where the copper was to be etched away, the ic removed, and the pattern finalised.
Then the board was made the anode in a tank filled with common salt solution with a straightened paper clip anode, and current passed till the pattern was completely etched.
This process, I feel, needs its own instructable and this I might do if wheedled / threatend / cajoled / asked / whatever works.