My kit has arrived safely! It was delivered earlier today.
Don't have time to build it straight away, but have looked at the parts. The Poseidon Blue keyboard looks great, although there's a very minor dent in the upper right corner of the bottom case. But you'd be incredibly nitpicky to be bothered by it. Pretty much insignificant.
Both the brass plate and the alu plate lacks the KIRA cutout branding, and just has a hole in it's place, but it's not visible when built anyway so it's not a concern to me. The Pearl Blue aluminium plate looks nothing like the Pearl Blue pictured. It's way closer to a silver:ish gray with slight blue tint, but it may just be my current indoor lighting. Will have another look at it tomorrow in natural lighting.
Also can't find any rubber feet bumpons in the package, but maybe zFrontier delivers without them? My Leaf80 from zF was also sent without. I've not been in that many keyboard GB's so I don't know if it's standard procedure to source them by oneself. In any case I have a few that probably fits.
All in all I am super happy with the kit. Thanks to Thesiscamper for pushing for updates and more information when there was no communication. That also goes for other GB participants that got us extra info whenever possible. Thanks everyone <3