After playing some more in the ages, I'm so very pleased to say everything seems to work flawlessly - behaving just as it should. You can imagine how happy I am!
Only two little things prevent it from being perfect: Gahreesen and the GZ.
Gahreesen top floor missing: could it be that somehow it's loading the "hood version" instead of the full one? I'm not sure how that is possible because I'm using Cyan's own age files, but I have no idea what could be wrong otherwise. If it's the python.pak file I'm obviously lost as well, because I wouldn't know Python from a Garter snake
Great Zero missing in Nexus: I could be all wet here as well, but when I added that code block Hoikas linked to, suddenly I got a list of pubs that weren't there before. It also consistently displays a fan age (ChisoPreniv) and I verified that code block is NOT in the file. Could it be that somehow, the list got shifted or something? Of course just to test I added the code block for Chiso Preniv to static_ages.ini, but I didn't notice any difference then.
I'd be so grateful if we could sort those two issues, because it would mean a 100% playable URU once those are sorted
Side note: Speaking of ChisoPreniv, is it possible to disable this altogether in the Nexus? If I leave the age files out of my server, it crashes the player when trying to use the link. If I add the age files to the file server, it actually crashes the vault altogether. Alternatively I'd ask how I can make it work, but I think fan ages is more suitable for a future phase of my Uru server adventures