2011 13" MacBook Pro [2nd,2C,M] + RX 470 @ 10Gbps-TB1>TB3 (Zotac AMP Box Mini) + macOS 10.13.6 [Otto Barea]  

System specs (model inc screen size, CPU, iGPU, dGPU, operating system)

• MacBook Pro 2011 Mid 2011 13", i5 2.4GHz, Intel HD Graphics 3000, High Sierra 10.13.6 (17G5019)
• 8 GB RAM, 512 GB Samsung SSD 830
• 25-inch (1080p) @ 240Hz, Alienware 2518Hf

eGPU hardware (eGPU enclosure, video card, any third-party TB3 cable, any custom mods)

• Zotac AMP Box mini, Sapphire Pulse Radeon RX570 ITX, StarTech thunderbolt 2 cable + Apple TB1>TB3 adapter
• I'm not using the USB ports on the Zotac Box mini, as they have poor performance.

Hardware pictures (note: require 5+ posts for "attach files" button to appear. Or can link from say http://imgur.com )

Installation steps (what did you do to get it all going?)

To connect the Macbook to the eGPU, I used an Apple Thunderbolt 3 to 1 adapter.

The first thing I did was to disable System Integrity Protection using this guide:
https://developer.apple.com/library/archive/documentation/Security/Conceptual/System_Integrity_Protection_Guide/ConfiguringSystemIntegrityProtection/ConfiguringSystemIntegrityProtection.html

The command I ran from the console:
$ csrutil disable

To enable the eGPU i used "purge-wrangler".  I just followed the instructions in this page:
https://egpu.io/forums/mac-setup/script-enable-egpu-on-tb1-2-macs-on-macos-10-13-4/

Because High Sierra has drivers out of the box for the RX 570, I just enabled the AMD drivers support for Thunderbolt 1/2 machines.
I did not selected additional AMD drivers

Benchmarks (Include a CUDA-Z or AIDA64 bandwidth pic. Optional: Valley, 3dmark, noting if it's on internal/external LCD )

I need to look for any susitable software for macOS.
I do not run Windows on this machine

Comments (eg: how has the eGPU improved your workflow or gaming)
I use this eGPU when working on my windows PC just becuase I like 240Hz refrsh rate in my monitor.  Very clear and sharp image.
I wanted to see if I could do de same with my old Mac
It works.