What's the going rate for a brand spankin' new, never installed Exidy Collextion multi? Includes an XL tee shirt This is from Mike's last run about a year ago.
If I recall that 5 volt version of that gate array is no longer available, I do believe you will have to use a 3.3 volt version and one would have to use another chip to bump it back up. Adding more parts might mean that timing will be different.
Most people who build projects, normally don't want to be stepping on the toes of the person who created the project in the first place.
Before any serious efforts can be put forward, one will have to get the blessing of the creator of this project. Without it, you will have to reinvent the solution.