Hi,
I'm a new member here. I just built an EVGA TitanX + AKiTiO Thunder 2 + 1000W power supply system, and have it up and running on my 2013 Mac Book Pro & thunderbolt display.
I spent a few hours figuring out power supply wiring and bending open the AKiTiO case. I used C clamps to helped flatten the bent section out, but it is still not very pretty. At least the external enclosure fits.
As far as benchmarks, the octane benchmark gave me score of 127 for the Titan X alone , and a score of 139 for the GT 750M + GTX TITAN X.
The basic guide was incredibly helpful, along with 2 other guides:
The automate eGPU script
https://github.com/goalque/automate-eGPU
and
How to compile tensorflow with CUDA support on OSX
https://medium.com/@fabmilo/how-to-compile-tensorflow-with-cuda-support-on-osx-fd27108e27e1#.aggzip20a