I just got around to reinstalling GC2 and picked up TA. I'm trying to update my map generator (previous thread here) so you can use it to do the grunt-work of putting most of the planets and stars down, then pull it into the TA editor and polish it off.
Unfortunately, while the maps seem to load into an actual game (most of the time), they crash the editor consistently.
I haven't been able to find any good information about the specs of the map file that would help pin this down.
I'm specifically interested if anyone knows the limits to how many of certain objects are allowed. (over 100 asteroids seems to crash the game, for example)
Editor is here: http://theharms.org/cgi-bin/gc2/webmap.rb - It's updated at least enough to get 22x22 maps
If you get errors when accessing it over the next few days, it's probably because I'm fiddling with it 
Thanks,
--A