This is a remake from Quake 3 Fortress which came out in 2000. When Q3F was ported to the free game Wolfenstein: Enemy Territory (since they were on the same engine) I helped finish off the maps on that dev team and it was included in ETF as well. You can check out the original shots for it at
http://www.etfgame.com/shots/levels/index.shtml (it was revamped for ETF visually, it was quite bland in Q3F)
A lot of the maps from there I port, as most of them were A+ maps that the larger population didn't enjoy due to the mod not being as popular as it could be. You can still get ETF and check it out for free though as long as you have Wolf: ET.