My story concept is that the terrans have adopted protoss technology and the zerg have made themselves merge with terran technologies and weapons. The Protoss have downgraded to cheaper and faster to build technologies making them easier to mass. So bacicly i have switches all the basic roles of the races. I made the terran un-massable, the zerg like the terrans and the protoss like the zerg and easily rush-able.
-will update soon.
EDIT: OUTDATED!!! STORY IS SUBJECT TO CHANGE