CHRP is....
Common Hardware Reference Platform.
The intention was to allow third party manufacturers to create alternative 'blessed' Macs and compete with the proliferation of Windows PCs. I believe SJ ended the program when he realized it would cut deeply into Apple's hardware revenue.
I did some work on the CHRP in the 1990s as it included a parallel port, which would have been very useful for driving the plethora of PC compatible printers.