By attack able, do you mean able to attack or able to be attacked. If it's the second one then just use the "toggle Invincability" trigger. if it's not then I cant realy help you... Have you tryed using queen with energy set to 0? or carrior with 0 intys allways. And I'm fairly certan you cant have a dropship not pickup units. you could try runing the unload units AI script, and having an air only location, that is a location with all the Ground setings unset. (just noticed your skillseting is beginer) your also going to need a newer mapeditor then staredit, if your using staredit. and you can disable any spell or unit from being built or used (even by heros I beleve) in the "players" tab under "settings"
good luck with your map, pm me when you need beta testors
