I've been carefully reading for 6 months and finally indulged... The criteria list was : small foot print, silent, somewhat future-proof that I can play and photo/video-edit with. I already had the screen, 2x 3.5 HDD 2TB in RAID 1 and 2x 250GB Samsung (840 and 850) from a previous built and a W10 OEM licence.
I can barely hear it and it sits right next to the screen, the temps are at worst in the high 50 low 60.
The overclock is stable at 4.7 with 1.35V, it took about 45 minutes to find the correct values and then I left it running RealBench over a night. I tried to lower the voltage further but it wasn't stable and I can't really be bothered investigating how much it would need for 4.8 either.
The GTX 1070 is an overkill for now (I'm still in 1080p) but it's an investment for the next few years, I don't plan to upgrade, I'll just overclock it when necessary and I like the screen I have, no need to change it for now. I don't think I have succeeded to get it hot enough for the fans to kick in, and coming from a blower GTX670, it's nice to play without having a hair drier sound!
The building process was really pleasant, a bit challenging due to the small amount of space, that's what makes it interesting. I did that with a friend in one evening with a few breaks here and there. The cable management is obviously the tricky part but I'm fairly happy about the result.
My 2 cents: take your time, if you do it, do it well so that you don't have to get back in the case, make sure you have enough cable ties and a pair of pliers, additional hands are welcome despite the small amount of space and 2 brains are better than 1!
I ended up putting both SSD at the front, I didn't have the cables with the 90 degrees bend in the right direction, too much clutter anyway. Just gently bend the ssd mounts and cut off the plastic bit in the inside of the front panel. Also be careful not to pinch any cable that you fitted under the front cover when you put it back.
The UEFI makes the OS install a breeze too.