Sokonomi

Chris21010you know that red line on the x99 FTW is led's that can be turned off? and honestly evga's ftw is one of the most neutral colored mobos out there, basically solid black.

I see, I wasnt aware of the LED light, it looked like a hidious red paint striping on most pictures.
Still though, it lacks a few key features; WiFi, Bluetooth, Internal USB2.0, pump header, U.2 connector.

ya they photoshop it to look more solid in color and not glowy like it really is with the red led's. you also have some odd tastes in mobo options. U.2 is an Intel proprietary connection while M.2 is its universal replacement, which the x99 FTW has. this M.2 can give you your wireless connectivity and why would ever want an actual USB2.0 connection instead of a USB2.0 headers on a mobo, which it has 3 of btw? 
 
OH, and to your initial pic, i had to actually grab the metal mobo tray and pull the whole thing towards the front of the case to get the slots to line up. this was because all the weight of the GPU's was actually making the tray sag a bit while it was laying on its back.

Chris21010U.2 is an Intel proprietary connection while M.2 is its universal replacement, which the x99 FTW has.

Its true that U.2 is intel only, but I WANTED intel. Nothing else will give me that sweet 2500/1300 Read/Write speed that will make my 4k video editing a heavenly pleasure. The U.2 drive will also never overheat due to its more conventional aluminum casing, unlike the M.2 strips that overheat and throttle more often than not due to lack of heatsinks. And then theres the fact that its 1.2Tb. I got it for a 'bargain' price of 600 euros as well (normally 1400). In short: Yeah U.2 is proprietary, but it does its job way better than any other storage device out there.

Chris21010this M.2 can give you your wireless connectivity

At the cost of being able to run M.2 or U.2 drives. So thats a waste.
 

Chris21010and why would ever want an actual USB2.0 connection instead of a USB2.0 headers on a mobo, which it has 3 of btw?

I was talking about headers too, its just a lot of internal devices dont play nice with 3.1, like the NTXZ Hue+ RGB LED controller.
 

Chris21010OH, and to your initial pic, i had to actually grab the metal mobo tray and pull the whole thing towards the front of the case to get the slots to line up. this was because all the weight of the GPU's was actually making the tray sag a bit while it was laying on its back.

I figured this out as well just now! I had to lift the GPU a little from the butt end so the PCIe slot 'catch' caught on to the PCB's hook, then putting the case upright allowed me just enough leeway to screw down the videocard nicely. I'm glad its sorted now, I was starting to panic a bit. :')

Hey guys, I ordered a DG-84 on Newegg but my case didn't have any drive bay adapter to hold my HDD. Is it normal? If it is, can I order it somewhere? Thanks!

I think only the 86 and 87 have the extra drive bays.

My problem is now my HDD is placing back to back to my 2 Rx480 so the temp of the HDD is kinda hot. It's up to 50 celsius (checked by Speedfan). Any suggestion please?

I think my hard disk is under the i/o portion of the motherboard. Or the lowest left position. I'm not at home to check. Can you place in the bottom area where the drive cages would otherwise be? Maybe tape it down? You really shouldn't be getting that much downward heat from your gpus. Heat rises and there is plenty of materials in the way that should restrict heat transfer that way. Do you have sufficient case fans? Pretty sure hard disks can run hotter than that and be OK, but I'd check the drive health just in case.