At this stage, my finalized design includes Arduino Nano 3.0, a breakout board and a few electrical components on a breadboard.
Will there be an appreciable cost savings from not buying a ready-made Arduino? The Arduino Nano clone being used costs $17.20.
And is it a good idea if everything is soldered on to a custom fabricated PCB board, including the components of Arduino Nano 3.0? The PCB board will cost around $10 at the quantities I'm starting with.