I've written all of my ideas here:
http://www.pecos-softwareworks.com/OXO_and_XOX.shtml
My First Pinball Design, XOX – Part 2 of 2
No playfield switches - Real-time video pinball tracking
Standardization using PC to replace MPU, Sound Card and Power Supply and USB standardized parts.
Many more.
These are state of the art design changes that would save a lot of money in the manufacture of pinball machines.