Okay, so GreentubeLAN is over, and the Q3A tournamet went ahead as planned. For those (on another site), who were wondering the map list we chose was:
-pro-q3dm6
-ztn3tourney1
-bal3dm2
-cpm24
-mike-dm17 (a modified version of Q3DM17 which suits 1v1 much much better)
-pro-q3tourney4

The tourney ran very smoothly, and alot of the games were very close. CPM24 seemed to be the map of choice for many players, closly followed by bal3dm2. ztn3 only got played once...