So I wanted to mirror my studio/gaming setup in my own studio to a smaller portable version. I knew I was going to have to cram 3 hard drives and also knew of the heat risks. I first started building in the Raijintek Metis paired with the big noctua cooler. It was a great build but wasn't quite small enough to fit in my backpack. So I ordered the Dan A4 and waited WEEKS!
Once I got it, I paired it with the Cryorig C7. With the C7, I had to underclock it to 3.0 ghz to get to normal load temps. The Samsung 970 nvme was also getting quite toasty. So I swapped the C7 for the Corsair H75 which I haven't seen anyone do yet but took my chances and it did fit paired with a Noctua NF-12x15 fan. Temps with the H75 are ballpark +10c to my big rig that has an EVGA CLC 280! I had to make sure the temps were correct by using different monitoring programs. Keep in mind that the H75 mounted on the GPU side requires a small form GPU so I purchased the Gigabyte Gtx 1080 itx card. No issues with fitment.
As far as cabling, it isn't too bad. I fit a 2.5 ssd under the psu and another 2.5 in the front of the case. To alleviate any airflow issues and the hot NVME drive, I stuck a slim fan from an old noctua l9i I had before. I used a zip tie to secure it. Adding the fan decreased the NVME temps down about 15c-20c and gave me peace of mind that there is some intake flow to the motherboard. I would advise to add this fan even if you didn't have an NVME. The case would benefit from intake air on the motherboard side. The radiator fan is also an intake because fresh cool air is better for the radiator than pushing out.
The sound of the fans are barely noticeable at idle. The only noise I hear are from the psu and gpu when things ramp up during gaming or video editing. During music production/recording the load is not enough to stress the system.
I enjoyed building this dual boot monster. The High Sierra install was a breeze since I just cloned everything from my big rig, and sync files between them. It is like having my studio setup wherever I go. If I were to make another pc it will definitely be in an itx form factor. The Dan A4 is well built and thought out and was very easy to build in.