Anybody is free to use this idea. Since the player 14 testing, I thought of this.
It will use player 14.
How it will work:
You will deliberately use the player 14 unit unplacable freeze and freeze the following: Bunkers, Reavers, Dropships/Shuttles/Overlords, observers, maybe a type of wall too.
Now for the dropships and shuttles, you can use them for bombs or something, while the reavers can be used with other reavers in the background to attack. Like if the reaver has a scarab, move scarab from background to where reaver is, and remove a scarab from that reaver. Bunkers can be loaded with marines and stuff. The observers are for detecting, and the wall could be to make the computer move a certain direction...
So what's the point of this? All the units will be covered by fog of war, but can still attack. The observer will detect, and certainly the wall will do its job right. The reaver can not attack directly, that is why you will use scarabs from another reaver backstage, but will remove a scarab from the frozen reaver's hangar. Units in bunkers will have no problem, and you can load/unload normal units into frozen units. You could probably also include something on the side. And to keep the fog, you will probably use a computer player-relative movement system to place things, since you will be able to see through the fog.
It would be appreciated if someone attempted this if you truely want to make a "new type" of defence map. I am not making it because I am occupied with other things.
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EDIT
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Oh. One more thing, you will have to use frozen enemies too. They won't show in the fog of war or be attacked unless they are frozen. You will probably need to move them to get them "moving". Well there is one thing you could do, is make a horde of normal air units follow the units. The units will move away from another air unit if it is near, but can not be directly controlled. Players would not be able to see the normal air units, but be able to see the air units they must kill. I am going to compile a list of which units crash when killed.
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EDIT 2
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Ok. There is no list of units, it's the last unit placed. If you kill the last unit placed(and it's frozen), the game will crash. Also, carriers can make interceptors too, but will not attack, like the reaver.