Nice job on the cables - clean and out of the way.
Great build - you made some solid choices.
I did not need a separate adapter; I bought the cooler from a site that carries the newer packaging that includes the AM4 bracket. When Ryzen boards first came out, you had to contact Deepcool to have them ship a bracket, but the bracket is now included in more recent packaging. The product listing should indicate whether an AM4 bracket is included. I bought mine from SuperBiiz. It looks like Newegg has a deal going right now, but it's unclear whether it is selling the package with the AM4 bracket included: the description omits AM4, but the specs include it. Good luck!
Is that a slot-load DVD drive that is actually accessible behind an old floppy drive faceplate? Fantastic!
P4.60 (after going to 3.50 first). So far, so good. No freezes, no crashes, and RAM is humming at 3200 using the default XMP 2.0 profile. I haven't tried to overclock, so I can't attest to whether the BIOS loses voltage settings as some people have reported, but I don't think I need to - seems to be working great without any real effort on my part. The Corsair RGBs are pretty and seem to work well now. I'd at least put them on your list for consideration.
Huh - turns out AsRock has made it amazingly easy to update the UEFI, so I did it, and so far I've had no issues with the new version. Looks like the memory is running at 3200 now, too, under the default XMP profile. So... now the build is even more overkill for me than before!
When the new bios was released, initial reports suggested some issues with it - it wouldn't store DRAM voltage changes, for example (which I don't necessarily care about), and a few people had trouble rolling back to a previous version (which I might care about, since the current bios works well for everything but memory clocking). Now that it's been up awhile without being pulled, I may try to update. But to be honest, even at the default timings, the rig is pretty powerful for my needs, so I'm tempted not to tempt fate. If I do get it working at the higher speeds, I'll report back.