The heart of this kit consists of a bifilar wound coil driven with two NPN transistors. While the circuit is easy, the coil will be tedious to wind since each wire is about 200 to 250 feet long. Neatness will help keep the size of the coil down. All parts are available through Jameco except the mirror, spindle and magnet. The options for the base will also have to be considered. Various materials can be used including wood and plexiglass.
It is important to keep the battery away from the magnet at least 5 inches. The base can also serve as the bobbin for the coil keeping the parts count low. The addition of a single small rectifier diode will allow for connecting an optional small solar panel to the unit. Installing a rechargeable battery will keep the top going indefinitely.