Here are the main characteristics of the SID receiver:

• single-channel receiver, tested from 15kHz to 80kHz
• included antenna preamplifier
• active order 4 bandpass filter (bandwidth of less than 200Hz for stations below 30kHz)
• measurement of the RMS amplitude
• linear output (not dB), offset setting
• 12-bits ADC
• USB interface
• power supply included

Last step is to put the PCB in a metallic box with the transformer, fuse and power switch.
See the pictures here below for assembly example: