I only wish I had discovered your blog sooner. It's one of my favorites.
Interesting that you have the HAL9000 computer image up. "2001: A Space Odyssey" is on the tube now.
From the drawing. we are left to *assume* that the nameplate, lens and speaker are all centered horizontally as well as positioned vertically. A good drawing should *never* let manufacturing make decisions about how to build something.
No wonder HAL had problems.