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I got the cable from ebay: Akitio Egpu 8 Pin to 2 x PCI E 6 Pin Super Low Profile No Latch 1 x Barrel | eBay As for the 750 Ti, it's fairly low power and low heat so I would think they all have roughly the same performance single or dual fan assuming similar clock speeds. BF4 should be able to run on medium settings but not entirely sure. The only thing I can tell you is that I've run Hardline on Med-High settings smoothly on my 960

Not sure what a bridge tool is but you only need the PCIE extender cable if your GPU won't fit into the akitio box. If you buy the single fan version it should fit quite easily otherwise you can get the extender cable. If you pick up the Akitio box plus the two items I mentioned you should be good to go. I've also seen some people having issues with the 2015 MBPr. I don't know much about it since I have a 2014 i5 and it works fine. You can search through the current guides and discussions to see if you can find anything.

500 Watt PSU is way overkill for a 750Ti. I run a GTX 960 with a 220W Dell DA-2 power brick. You can find it for less than 20$ on ebay (for example). Along with the Dell I bought an 8 pin to 2x6pin and barrel plug which should give you everything you need to put it together. All you have to do is plug everything together and then install the drivers in windows.

I recently built nearly the exact same setup except with a mid 2014 13" MBPr and a Gigabyte GTX 960 ITX. It was very easy with everything plugged in in 5 minutes. Then another 10 min to detect card and install drivers. I use the same boot procedure and it does hang sometimes (10-20%?) but usually a power off and on fixes it. Just need to be sure the Dell DA-2 gets powered off as sometimes it can still be powering the Akitio board for as much as 30 seconds after switching off my power brick. I occasionally get windows startup repair starting to load and hang but its fixed by shutting off and booting into OSX instead.