I wouldn't want anyone to go to the trouble to make one just for this game. I have looked at the editor and it needs a lot of friendly work. REALLY!
But, I thought there might be one out there that someone could suggest/lend.
BUT, if generating one randomly and editing it to make start positions (and if teams can be placed so that they start side by side) can be done by someone (someone who will take a casual look at the map and try to shift the teams so that it isn't obvious there is an advantage to one or the other), then that's fine too and I would appreciate it.
Of course, there may be no one interersted in such a challenge
.