My main concern is, as mentioned elsewhere, ritual magic, especially with the proper metamagics. Got an enemy? Let's use radar as an example here, because its easier. Build a sympathetic link or similar and cast a Force (presumably Signal) 6 or higher on your target. Meanwhile your Rigger's Tower is floating around the city, loaded with Heimdalls. If your opponent isn't in a radar blind, he takes a bunch of missiles to the face as soon as the Tower blunders into the target's Signal range. Forget the to-hit bonuses from specialized hardware just command all the missiles to aim for the designator once it reaches or rises above ground level. If your target is in a radar blind, he has to come up with counterspelling before leaving it or the same thing happens.
Total Investment - One mage of Initiate level 1+ with appropriate Lodge, Sympathetic Linking, Designate spell and Magic+Ritual>10 and
One Rigger with less than 50k worth of drones.
Net result - 10 High Explosive Missiles up the nose of someone whose location is unknown at the start of the ritual fired from 10-15 km away (based on Heimdall fuel and Signal 6-7). stagger the launches just a bit and you could pretty well cut a tunnel into the Aztechnology Pyramid to take out a target inside it.
None of the other stuff is Milspec or even especially rare. If the Heimdalls seem like overkill, replace them with a network of spy drones patrolling the air looking for the signal. Either way its pretty scary compared to Detect Individual.