In 2004/05 I did a Q3 remake of the old QW map UltraViolence commonly referred to as UltraV. It was hosted on our local servers with good feedback.
However at that time due to studies and other personal reasons, I drifted away from Quake and since returned in 2009.
Unfortunately in the interim period my hdd crashed and I lost quite a bit of data, including my workings for the map. I managed to get the final release from another player I met on the QL servers.
If I recall correctly from the years I did use GTK, the final .bsp cannot really be edited. Is this still the case and if so how would I be able to proceed with marketing my map? I must add I also lost my Q3 so I would have to purchase a copy of that as well.