This is a slightly modified version of NeverDie's nRF24L01 adapter board. It fits his base platform: https://www.openhardware.io/view/22651/Version-10-atmega328p-test-platform.
I've set up a Github repository to house the KiCad files for this project. While the Gerber files and such can be found here, you can also find them and the KiCad project files in my repo.
I have not had the board fabricated. It has NOT been tested.