Interesting comparison. Please note that the DAN A4 (at least my v1) also offers a spot immediately behind the faceplate above the power button to mount a 2.5" drive. I removed the drive tray below the PSU to gain additional room to stuff the PSU cables.
If I'm not mistaken, there is no SATA cable as the drive is NVME and slots right into the mobo (M.2 slot).
Unless you're referring to the device plugged into the SATA port in the lower left of the photo.
@Josh | NFC made a video posted here https://smallformfactor.net/forum/threads/stx160-0-the-most-powerful-atx-unit-in-the-world.934/page-18#post-40542 reviewing a custom unit with a socket CPU and 1060 running on 160W and talking a bit about the build.
TL;DR: Use a higher rated PSU for this...
Reminds me of an inverted FT-03 mini (which is basically a SG-05 with the front on the bottom). The DSE Vertex concept is organized along similar lines, too. That being said, this one would be all acrylic, right?
Nothing wrong with either company. I'd personally wait for an industry review to post before picking up the SeaSonic over the Corsair, but it seems from above that you might've already pre-ordered a 9900K, so apparently that's just me.
If you already have 8600k and 1070ti, I don't know why you would "upgrade" as the cost/benefit ratio beyond what you already have is arguably poor. Unless somebody's holding a gun to your head forcing you to spend on new hardware, I advise you to sit tight and wait on 7nm GPUs and Intel to...
Many of the Dells are custom motherboards designed for their cases only. Not saying you couldn't do it, but you may need to build a custom case to do it as they do not necessarily follow standard form factors and standoff placement.
Best I can suggest is to put a USB cover on your front panel like this (not the cheapest one listed) https://www.amazon.com/dp/B00W8YAWDQ/?tag=theminutiae-20 and maybe paint silver if you have a silver A4...
Maybe ask questions in the NCases forums on the site to get a more focused audience for your question. Please also peruse the build logs section to see if anybody has built something close to what you are wanting to achieve.