The thing with the Troop Crawler doesn't work - once it's built, the game crashes to the desktop.
About the missiles - that's the problem, the Mig has to have a pretty large payload and missiles with separate roles. And though this kind of weaponry works, it would be nice if the ammo pips showed themselves for both weapons.
Concerning the Missile Defender, the armor/damage/life are the least of my concerns, what I need is the inability to fire at infantry.
Anyway, thanks for the ideas.