The aim of the build was make it:

Small - Decent looking & compact sizes. Case was first part I have been looking for. Also I took lot of time to make "research" of cases on market. Real name is Cooltek U2 and suits for m - ITX format with volume of 15,2 l. Weight of whole rig is 6,2 Kg. Material is decent looking aluminium. During the building I changed rear "exhaust" fan with Noctua NF-S12A to make better airflow & quieter and remove back grid behind fan. It is suitable to the living room as well.

Silent - Without HDD and fully controlled fans, include monitoring PSU, my build is completely quiet in 2D / idle mode. It means all fans could be completely off thanks to big cooler on CPU. My current setting of all 6 whispering fans is set to 300 - 400 RPM. In 3D / gaming mode noise level is barely audible in room. The most noisiest part is video card with 60% RPM and more.

OC & Airflow - As I mentioned above, choose the right case was the biggest problem. Fortunately all parts suits inside with almost no space reserve. Because of big CPU cooler assembly and disassembly is not easy. It takes lot of time and the order of steps at assembling must be successive. Fully modular PSU is connected to motherboard with monitoring USB cable. With Corsair RM650i you can monitor PSU’s efficiency, power in/out, temp and Fan RPM. In idle mode, power in is 40-50 W, in gaming mode 200-220 W whole rig. Before purchasing of case I have read positive reviews of case’s airflow. PSU as second "exhauster" helps lead away warm air from inside. The airflow direction is from bottom to top-rear. The most influential part of warm inside is video card. This part has the coolest air at the bottom of case what is very helpful for it.

Parts:

Corsair RM650i and NH-D14 are overkills maybe, but good for update in future.

New Skylake CPU is economical with good OC.

I have added second storage with faster speeds, because EVO850 was not enough for gaming, etc... (last picture compares speeds - right one is m.2).

Upgrade:

1. I replaced original fan from PSU (picture n.7). Of course, I am aware of that I lost 7y waranty, but now in case there is fully Noctua, what is best fans. Additionally I put slim-profile fan between CPU cooler and video card. Width is only 14mm. (pictures 11-12).

Disassembling & assembling:

Trust me, it is a long story, you don’t want to read that ;)

If you have any questions, feel free to ask, I can add more photos afterwards,

Cheers.