I go back on forth on whether or not to have aeros on the map. If I am just designing it for ground units, I the map can have more detail and better performance. I think the VTOLs will work well, I'm just not sold on the viability of aeros on the map, and I'm not sure having them is worth the greater view distance and lower street level detail required to make their performance acceptable.
Keep in mind that the long narrow streets are going to be FBomber's dream. Very little room to get out of the way of a bombing run, and AA guns are going to be mostly ineffective against aerospace. The tall buildings make it so the only aircraft you can shoot down are the ones flying down the street you are on.
I would like to see some parking garages so mechs (or maybe just vehicles) can get up off the street level and walk up to the roof. But thats pretty minor. its an AWESOME map.
I will concur on the suggestion of covered areas allowing mechs and vehicles to avoid aero.
On the matter of aeros, I would say that for the same reasons a mech is difficult to keep targetted for a ground attack in a city area, an aero has this same problem. The amount of setup time involved in dropping fire bombs or Tbolts, including the approach through lots of high rise buildings that are all potentially quite fatal, means that all a mech has to do is turn a street corner and the aero's approach is ruined.
Just as a mech can use buildings as quick cover from enemy mechs, so too can they do this with aero.