Tell us about yourself!
In the NRF library you can setup the CE/CS pin to another pin. Each SPI device needs a different pin for that to determine if the device is active or not. You can also see that in my pin numbering. CS/CE of the Ethernet is on D10 and CS/CE of the NRF is on D9 (which is adjustable when initializing the NRF module). Hope this helps!
I think "Microcontrollers IV, Revenge of the Microcontrollers". But it's still three awesome projects all together! Love it!