I bought all the parts before PCPartpicker flagged any compatibility issues, but everything did fit. It didn't fit well, but I'm a mechanic and I can come up with some interesting contraptions. The GPU was a nightmare. I had to twist/flex the PCB to get it into the case at an angle, then line it up with the MOBO through the use of some pretty severe force that I'm betting no one else would want to try. There is no slot or space for a 3.5" HDD, but there is a spot for a slim DVD drive. I installed the SSD into the slot for the slimdrive, and I ziptied the 3.5" HDD underneath that just above the intake fan and the PSU. I also removed the bracket for the two SSDs that is mounted in the bottom of the case, it left room to hide cables afterwards and leave a clean tunnel for airflow.
I use this mainly for gaming and video editing. I do travel a lot because I'm in the military, and this small rig has been pretty awesome. I can play all my games, emulators, and movies as well as edit professional style videos with Adobe Premiere Pro thanks to the 3TB HDD inside.
If I could change some things about my build, I would definitely have gone with a GTX 760 instead of the 270X because Asus builds one that is much shorter and would fit better in the case. That's pretty much my only complaint, I was scared I was going to break my brand new graphics card just trying to get it in the case.
I originally had an FM2 MOBO and an Athlon x4 760k in here, but I upgraded to the I5 4690s (The s version because of the lower TDP in this small box.) I have since also removed the Corsair H55 and am using just the stock intel cooler for the CPU.
Update* Geekbench score Single Core: 3758, Multi-Core: 11429 Cinebench OpenGL: 116.41 fps, CPU 538 cb Realbench Image Editing: 100923, Encoding: 66525, OpenCL: 31131, Heavy Multitasking: 55600, System Score: 57318