2017 15" MacBook Pro (RP560) [7th,4C,H] + RX 580 @ 32Gbps-TB3 (Orico TOM2T3-G40 * ADT-Link R43SG) + macOS 10.13.6  

Hey guys, 
thanks for wonderful forum and very useful tips/builds/answers!

After a few months I finally did this,

eGPU hardware:

1) Orico TOM2T3-G40 => m.2 90$

2) ADT-Link R43SG 45$

3) Dell DA-2 D220P-01 PSU 25$

4) RX580 Nitro+ 4GB preowned 200$

System specs:

2017 MacBook Pro 15.4" - i7-7820HQ/HD Graphics 630 iGPU & Radeon Pro 560 dGPU/16GB RAM/512GB SSD / macOS 10.13.6 High Sierra

Actual Build:

I was inspired by this build and how minimalistic, how elegant it looks. Almost every step you are likely to find there.
Thank you sir, thanks for inspiration!
My biggest concern was about 580's TDP, then I've decided to give a chance to Dell DA-2,
so let's see what comes of it.  

After impressive experience of the 4K videos on YouTube, (LG 27UD88-W),
I've tried to figure out my bandwidth and compare set-up to other's builds in general. 

1. I've found out that GPU fans doesn't work in the idle mode, and GPU temperature doesn't increase upper than 61℃. Is it a good sign?
   *Update:
                  The answer laid down in the GPU's vBIOS firmware.

    

    

    

    

2. The limitation of the PCI 3.0 x4 bandwidth implies H2D of 2200 MB/s and D2H 2600+ MB/s or my H2D still might be improved? 
   *Update:
                  The answer is ~there~
    
3. Is there any chance to avoid kernel panics after unsuccessful attempts to disconnect eGPU with native toolbar?
   *Update:               
                  1. Mac's NVRAM, PRAM, and SMC Reset - No Result        
                  2. sudo nvram AutoBoot=%00 to disable "Boot on Lid Open"  - Not a clue
                  3. Try to play with SW2 jumper
                  4. Reinstall MacOS  - Solved the problem.

    

    

    

    

   Going down to sleep and unplugging eGPU after ADT-Link turned off makes a temporary solution to reduce the harm from hot shutdown. *(probably)

4. Does the GeekBench 5 results (External Display) are accurate enough just to say that set-up is working fine, without any further tweaks and improvements? 
   *Update:
                   The answer is ~there~      

Hardware:

Spoiler

Tiny Pics

BenchMarks:

Spoiler

Numbers

Once again, thank you guys for very informative and very supportive community, glad to be part of it! 

Cheers!