U make Rebuild 3 features should be Captureable Tank Factories Where u can use tanks and build other weapons and so on; other things should be the same:D
To Defeat most of the Bosses: Upgrade Bazooka to Stinger or RPG-7 after that upgrade Grenades and machineguns ( M16 , M134 and to Minigun) AFTER that upgrade your Defence (ability 4) and Stamina + Running speed! Now ure Unstoppable Believe me ! this worked for me these last few days BELIVE me u will not be killable :D
 "Rebuild 2"){kind=icon}
 "Decision"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "The Imperium"){kind=icon}