Hehe, that's cool... but if you're making a map, I think it would be better if the clans could choose their own territory. Otherwise, there will be arguments and so on...
And also, you could make strong players from the clan lords, and give them part of the clan's territory and create a special emblem for them. =)
P.S. Maybe something similar already exists... I don't know... ))
P.P.S. The art idea is also interesting. In principle, you can come up with a lot more...
But the question is, will you only be able to play as the races that are in the clan, or will it be like in regular tournaments?)))
P.S.S.S. And don't put them next to each other! Otherwise, some will have freedom around them, while others will be surrounded by "enemies" =)