I like these, I think they have a role and they are good at it. It would be trivial to make a flamey variant which exchanges the 2xMG for a Flamer and a Firedrake, even more infantry killing, different cover interaction (I forget the rules but I "think" flamers ignore damage reduction for shooting into buildings and Firedrake, while not represented in the tabletop, should significantly reduce overpenetration and therefore civilian casualties) at the cost of hard target firepower and higher building damage.
In fact, with all these possible variants I'd try and fiddle it so that one arm had a 2 slot, 200KG MWM with twin MG being the default loadout, then you can pack something like an LRR or Magshot if you want to press your urban suits into a longer range anti-armour role.