Are those the stock cables...? If so, a bit more into how you cable wrangled them, please...!?!
And what is that material you have at the top of the chassis...?
Yeah they're stock cables. I just plug everything in the PSU and board then shove all the cables in the back making sure they don't hit the bottom fan.
The top is a foam dust filter I cut to size and glued to one of my silver tops. I use it when I'm not running tests.