I was curious about the real story about CAPCOM and BBB, and had heard alot of stories about random warehouse engineering drawing finds, bankruptcies, non-standard parts, etc. I may have missed this history writeup of Capcom and BBB, but I just ran across it and it seemed like a great read. It answered alot of questions about early pinball, cleared up some folklore along with the rise and fall of chicago's pinball companies, gene cunningham, BBB, etc

It's a long (15 minute) read, but very conversational in tone and easy to follow:

https://www.polygon.com/features/2017/3/21/14937540/history-of-big-bang-bar-pinball