One thing that I've been intending to do, since I plan on running Session 21 on the table, is to use the Tactical Addendum rules for vehicular combat. A Time of War handles them in great detail, but as I expect this engagement to be only a few vehicles and infantry at any given moment, I can greatly simplify them. Here are the basic tenants of converting BattleTech mechanics for A Time of War's Tactical Addendum:
Initiative: Vehicle initiative depends on vehicle type. All of one class of vehicle move, then all of the next class, and so on (p. 206)
Movement: Multiply movement values by 15 to get meter/turn (Total Warfare's 30 meter hexes and 10 second turns vs. A Time of War's 1 meter blocks and 5 second turns.)
Weapons: Range in meters is just range in hexes times thirty. Characters and NPCs up to Battlesuit-size use Size Modifiers when shooting at big or small things. Anything larger than a Battlesuit has a computer take care of those modifiers for it. Vehicle-scale shots splash, and those that miss scatter like artillery. These splash zones are often measured in centimeters, however.
There's obviously more to it, but that's the elevator brief on the Tactical Addendum. I look forward to getting a chance to run with it. I think tomorrow I'll talk a bit about how it affects the survivability of infantry formations.