i'm going to throw my 2 cents in here for what it's worth. first off city fight is brutal. i did some training in berlin and a cat would have to be lucky to survive.
i like cutting the one corner off but, like bish, i am not locked into rules and i tend to be symmetrical, especially since i am a technical illustrator by trade. i think the prone MG team needs some rubble in front for protection. and i n would block the door to the left of the tripod team because they ain't leaving that way.
this set up is like the depuy (USA general) foxhole concept. it works great until a position is breached, then it all goes to crap.