After continued modification and test, test version of CM13 firmware of Elephone P9000 and Elephone P9000 Lite has been launched.
Most of the bugs in the beta are already solved and fixed, but not everything and the version still struggles with tethering, GPS accuracy and memory optimizations. But they are still working on that so hopefully soon everything will be ironed out fully. If you would still be interested to install the CM13 beta nonetheless you can download it here for the Elephone P9000 and here for the Elephone P9000 Lite. If you want help Elephone to test CM13 firmware and if you find bugs about P9000 and Lite then submit the bugs also other threads you find on official Elephone forum.