Construction can be used for many other machines as well.
Example of PCB using SMD components.
Connect composite in wire to the resistor by the RF box where the black clamp is placed. Audio can be picked from speaker output using about 150kOhm in series.
Available 5V shown with red and blue wires in top right position and composite signal source taken with a red clamp on a resistor by the LED. Audio hookup point in the last image.
5V and ground is hooked up on the 5V regulator, video is taken from capacitor pin (yellow wire).