Upon a bit more research, it does indeed appear that the REBIRTH iteration of the GL symbol was used up until the creation of the various other Lantern symbols for BLACKEST NIGHT, when the GL symbol was reworked into the one which became predominant in licensing. However, the REBIRTH version still continued as part of the cover logos for both GREEN LANTERN and related series, such as GREEN LANTERN CORPS.
As can be seen here, both versions of the symbol even coexisted on various covers during this period.
After the end of GREEN LANTERN vol. 4, the books were relaunched as part of DC’s New 52 publishing initiative, and the logos were reworked to incorporate a new version of the traditional (non-angled sidebars) GL symbol.
Before:
After:
Again, I haven’t even read these stories, yet, but a quick glance indicates that the continuity of the symbols is ALL over the place, with the series’ cover logos often conflicting with the actual interior art. A single issue might include the REBIRTH symbol, the classic GL symbol, and Ivan Reis’ “hourglass”/JUSTICE LEAGUE (animated)- style variant, all at the same time.
Anyway, logic dictates that since Van Sciver’s ring design had been superseded by Reis’ by the time of BLACKEST NIGHT (and the creation of the revised licensing symbol), I should therefore stick to the REBIRTH version of the symbol for my model based on his work.