Not shoo tabby.
For its heyday, the 10900K and that Meg board were GOOD kit.
You won't be seeing full throughput on the SSDs. But that's okay. What you're "missing" will be virtually indistinguishable without resorting to benchmarking software to tell.
You're right that you won't be taxing the 4090 on that dinky screen. WHO CARES? You got it FOR FREE. I, personally, couldn't justify paying the sort of price a 4090 commands. But whatever works man! Also, you've got a large enough frame buffer on that card that you can crank up the FSAA ALL THE WAY.
I'm, not really a great lover of LED.
I have a high end keyboard (Apex Pro). And I use the LED there for visibility.
Then again, my computer resides in my room.
But the rest of the case lighting, I turn all that crap off.
Personal preference.
The only thing you could probably improve is cable routing for the rear exhaust fan. It's just kinda dangling there.
A bit of careful routing and a couple zip ties could clean that up and lock the cable down.
Other than that, your rig's cleanly and decently cabled.
Good job .