Methods and apparatuses for modifying a Gerber-compliant data structure that is representative of an existing printed circuit board (PCB) layout are described. This may include obtaining a Gerber-compliant data structure which includes layout information describing the physical layout of a PCB, obtaining modification information representing a modification to the physical layout of the PCB, and automatically modifying the Gerber-compliant data structure to seamlessly incorporate the modification information to create a new electrical connectivity structure for the Gerber-compliant data structure.