This was made using a Cyclonus torso with a KO Starscream's legs. I wanted Metalhawk to look slightly futuristic but still recognisably a jet.
There is a bit of a gap between the legs and jet body in alt mode, kind of like animated Blitzwing. The head also doesnt fit seamlessly but I can live with that.
The head is a G1 Twin Twist, with the ear antenna made from left over bits from robot heroes Kickback and Tankor.
I first tried adapting a Bumblebee head but it didn't do anything for me. The head on the KO Starscream I took the legs from was badly molded so I couldnt use that.
The use of the tailfins as hand weapons was taken from PrimulArchangel's excellent custom.
Pictures!
Scene from IDW's Robots in Disguise
The Bumblebee head version