A noble quest, but ordinary seven-segment displays ... [Esai] traced out each segment with a marker. Two LEDs make up each segment, and they’re all connected to a breadboard-friendly pin header ...

He also added some LED-based VU meters, a couple of 7-segment displays, an LCD display, an analog voltmeter, along with plenty of I/O connectors. The Ultimate Breadboard might look a bit daunting ...