I finished putting my setup into the Cerberus and I've noticed some additional issues:
1. There are multiple scuffs near the pegs on both side panels. Here's a picture of some of the pegs, but the scuffing is pretty much present on all of them. This may be a result of shipping the panels attached to the case, but in some areas it also looks like it's been dinged quite deeply, which don't look like it could be caused by shipping:
2. The side panel seems to have been cut out in multiple passes, and there's lips where you can tell where they moved the blade. This picture shows the biggest lip, but there's multiple places where this shows up, on every side of the panel. Based on the frequency and repetition of these lips, it seems like the cutting blade is only 4-5 inches long. The bottom right corner of the first image in this post also shows this lip:
3. One of my panel's corners is dented. Also note the long scuff line and the dings, which look fairly deep:
4. I have a scratch on the top of the case, near the power button. Although it's hidden behind the top panel once it's attached, it's not a great feeling when it's the first thing you see after taking off the top panel:
5. The power button is not centered and tilted slightly forward:
6. There are no instructions provided and some of the installation is non-obvious, so I've had to look at images of the case online in order to put it together. However, there are still some things that I'm unsure about. For example, I have no idea what these large self-tapping screws are for (Edit: It just occurred to me that these are probably fan screws, just unlike any I've ever seen before):
7. The countersunk screws for SSD mounting are too long. When I turn the screws as far as they will go in, the SSD is still loose and wiggles around. They need to be 1-2mm shorter.
8. Several of the screw holes on the case were not properly blocked off when it was powder coated, so I couldn't easily put screws into them. The 3 places where I had trouble were the upper right corner of the rear PSU mount, the front left hole for the front PSU mount, and one of the holes on the brace for the carrying handle. I managed to get them in by turning the screws really hard.
9. The PSU mounting screws for the internal SFX kit don't seem to go into my PSU (SX500-LG). I could only get 2 turns in before it felt like they hit a hard stop. What's odd is that the screws that came with the SFX plate kit look the same, but they were able to go in just fine.
10. There are only two types of screws provided for internal component mounting (aside from the large self-tapping screws mentioned earlier): M3x6mm button screws, and M3x4mm countersunk screws. This is fine for the motherboard and SSDs (aside from the length as mentioned in #7), but the issues is that the PCI slots are supposed to use #6-32 UNC screws, but they're tapped for M3 instead. This means that not only can you not use any of the accessories for PCI slots (like thumb screws), but the screws are also undersized, which is a big concern when 2 screws are responsible for holding up a $800 GPU and just barely covers the holes on the GPU's bracket. I might have to pick up some washers just for some peace of mind.
10. This one isn't an issue with the case, but it's something I wanted to point out: if you have a SFX-L PSU and the Asus ROG Strix 1080 Ti, you won't be able to use the front SFX mount. The GPU is too long, and with the cables attached to the PSU, the graphics card won't fit because the PSU's cable push it out of the way. I tried squeezing the cables as much as I could, but it's off by way too much for the Strix to even come close to fitting.
All in all, I'm fairly disappointed with the construction quality of the case. Edit: Sliger has informed me that my case was an exceptionally bad example and not indicative of their usual quality.