Its actually a fusion of the traditional G1's Devastator and the WarWithin's plus alittle additional touch...
The face is from the ShogunMegazord, goggles helmet BFS using styrene...
Actually I havent thought of any storyline yet.. But was hoping maybe it would go something like this... (going to sound something like TransformersTheMovie.)
After the great cybertronian war, all the deceptions are driven out of Cybertron, escaping to the deep space with the aid of Astrotrain... But having all damaged and wornout, Astrotrain burned out his last bit of his spark, with all the decepticons in his passenger cabin, Astrotrain's body slowly drifty through the space and landed on this monster planet Unicron, who later reformated all the decepticons making them his pawns... And Devastator is also being "upgraded" with a more intelligent mind(constructicons are scientist and builders afterall)... Now the all new Devastator is not just a powerhouse but a strategist as well...
There U go, a small little crappy story.... Not very good in writing stories...