Matthew Breit told me that he is going to release his maps (I assume his non-release-version Quake 3 maps) in the .map file format under the GPL, as well as the textures.
Here you can read the dialogue so far.
Now I know that your maps have specific needs for being balanced, but perhaps his maps can still be of use for you.
Tell me what you think and if you want to adopt/remix the maps to Tremulous as soon as they are released.