Click for larger image: ~1077 x 709, JPG.
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Nano Body Pieces:
Front    Floor    MCU+volts-reg    MotorDrivers
Front    Floor    MCU+volts-reg    MotorDrivers (Front with different eyebrows/nose)
single-edge    single-edge    single-edge    single-sensor    single-sensor
Holey-board fillers, 0.1" spacing.
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MotorDrivers:
Has 74AC245 on one side and two each Si9988's on the other side.
Both take same inputs and same outputs so both cannot be used at the same time.
Pick one type ie. '245 or '9988's.
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Front:
Two IR sensors, IF471FE, Digikey, IR-LED's etc.
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MCU:
16F648A outline, LM1117-5/SOT-223 body(bottom), Reset Button, LED, Crystal, MCU-pin pads on bottom.
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Floor:
Four edge sensors.