Case delivered and build went fine. Feels so solid once completed. Had to move the default power intake as it was fouling the AIO, but other than that it was plain sailing after all the research and planning I'd done - thanks for all the info shared here and elsewhere.
Asrock Z390 Phantom ITX
Sapphire RX580 8GB
32GB Corsair Vengeance DDR4 3200
2x 1TB ADATA XPG SX8200 Pro NVMe
Corsair SF750 SFX
Celsius S24 AIO
4x Noctua NF-A12x25 (2 for AIO)
Ncase M1 v6
Nice build! Would appreciate it if you could report your temperatures in the 9900k thread I set up here: https://smallformfactor.net/forum/threads/9900k-in-ncase-m1.11617/
Im struggling with cooling my 9900k.