Plenty I could say I would have done differently, knowing what I do now, but still absolutely love how it turned out. GPU was hard to get hold of but the 1660 Super suits my needs for now and all set up for future upgrade.
Any comments/suggestions are most welcome.
Update: added a third cable extension for 8 pin CPU cable. The ROG Strix PSU cables were white but thin. I've used 3 different cable extension manufacturers here. While I am happy with the 24 pin and PCI-e ones, I hoped for better on the 8pin CPU one. Cable management has got messy as the thin PSU ones are now buried next to the PSU. Next investment is cable mod replacement cables but just need to think about the colour scheme.
Update 2: Switched out the Cooler Master 212 Hyper Black for the Noctua NHU12S Chromax. Miles better RAM clearance and even cleaner look, in my opinion.