A good read and very informative.
The biggest influence to the 1098 build
was GSC's Codename Outbreak from 2001
that featured a Gunslinger Armor Suit and many
of the Inventory ideas & concepts that ended up in SoC.
It's just a shame the outstanding companion mode
from that Game has never made it to the Zone.
(Still working on the screenshots, might also do an entry for Clear Sky's build 3120...)
There is definitely some influence from Codename: Outbreak: enemies wield the Groza, while the headbobbing and certain sound effects were carried straight over. Firestarter in turn inherited some content from Oblivion Lost: the game itself is styled after Quake Arena and Unreal Tournament, but its shotgun and assault rifle are modifications of the Protectra and Groza from build 1098, and its rocket launcher incorporates details of the old F2000 model.
Thanks for the kind comments, everyone. If anyone has any additional observations about the old builds - or knows about builds I don't have - feel free to chip in.