This vehicle is obviously not meant for really heavy fighting....4" of titanium will get you dead if you are hit by an RPG, and that's what most people will use on such a vehicle, because they don't have as many .50 cals as any army employing this. if you want it to do heavy fighting then give it depleted uranium armor at 6", but you probably won't be moving all that fast unless you up the engines and tracks some, you will probably want to up the engines even if you are going to keep this thing smaller, but having the missile launchers is just asking to be shot with an incendiary round I would toss them in any large quantity (one or two tops, and put those only on specialist anti-armor units) one monitor with a HUD will cut the mustard on the inside of the vehicle.