The static towers of the Marakan flow have proven to be one of the most popular venues in the Tournaments since their introduction last season. The true nature of the modern gladiator is revealed as participants butcher their way to victory. Whether competing in CTF or Bombing Run competitions, players must keep one thing in mind at all times as they do battle in the poisonous skies of Purgatory -- It's a long way down.
CTF-ElecFields was scheduled to be included in the retail version of UT2003, but it got cut because "the shadows/decals were killing it". (source) It, however, got launched as part of the DE Bonus Pack.
The whole map was originally modelled as one, huge static mesh. Later on it was split to several, smaller static meshes. Juan Pancho Eekels has a picture of the structure mesh on his website: 
On the inside of the central structure, the level's author has left his signature on a wall.