WaW'85 is already a complete wargame. All you need to convert the rules to miniatures play is range/scale conversions. That's it. Use all the other rules as-is. It has terrain effects. It has command range.
Miniatures don't need facing rules any more than the hex and counter game does. You can house rule them if you like. (+1 armor save penalty to attacks from the rear 180 degrees, for example.) Remember, each unit is a platoon, not a single vehicle.