This is my custom Mac Pro 5,1 tower. I built this machine for editing and it is a beast at it. I am excited to post this build because it is the first custom mac on builds.gg (that I can find) I have put a lot of work into this computer customizing it and making typical PC parts work in it. I recently added the second graphics card and I made an entire thread about it over on the mac rumors forum if you want to check it out. https://bit.ly/2Z5yftz So far I have done a lot of custom work just on adding the second graphics card, but I plan to do more custom mods to the computer. I have worked a lot to this computer since I purchased it about a year ago and I plan to continue modifying and improving it. I am currently looking to purchase a matching shroud for my second graphics card so they will both match. I also plan to add two more 8TB WD gold hard drives for a total of 24TB of hard drive storage space along with a 1Tb M.2 boot drive. To make the machine a little more modern I am going to add a usb 3.1 card to the computer along with custom front panel usb 3.1. I am also looking into getting the case powder coated a color similar to space grey to give it a more modern look. The last mod I might do is water cooling the CPUs. For this, I would replace the stock Apple heatsinks with dual 120mm aios.

Specs (Since some of the parts are nonstandard or server parts I decided to list them in the details as well. I had to list all the parts in my build below, so some may say To Be Determined.):
CPUs - Dual 6-core Intel Xeon X5690s
GPUs - Dual EVGA 980Ti hybrids
HDD - WD Gold 8TB Enterprise Drive + 1TB stock Apple HDD
HDD Mounts - OWC Server drive mounts for Mac Pro
SSD - 120 GB Samsung EVO Drive
RAM - 128GB DDR3 ECC Samsung memory
PSU - Stock Apple PSU + 750w HP 80+ Platinum Server PSU (Custom cables going to GPUs)
Cables - Custom braided cables that I cut and soldered to work with the HP PSU
Motherboard / Case - Stock Apple

Why I did not build a Hackintosh. My original plan when purchasing a computer was to build a Hackintosh, but after some research I found out about the Mac Pro 5,1. I did some research and found out that after some upgrades you could turn a mac pro 5,1 into a beast. This computer cost less to build than a Hackintosh and significantly less than buying a new computer from Apple. What really sets this computer apart from a Hackintosh is that it is a legitimate apple computer and therefore it is super reliable, everything works perfectly and I can update it without worrying about my hardware being incompatible. These things are very important to me because I use this computer for video editing and app development on a daily basis, so therefore I cannot afford to have unexpected complications. It also runs the latest version of MacOS Mojave.