I always wanted A devastator figure, but I never got one, so I decided to try my hand at a scratch build.
I used some Cat vehicles [Basically the equivalents of the constructicons, except for hook ( I used an original one I got for cheap because it was broken ) and Mixmaster ( got a similar looking truck from another range ]
I also used the previosly mentioned "Bobba Fett Bionycle-ish thing" mainly because of it's articulations, which are pretty great)
I used a small starscream figurine for the head. And a Centurion's jetpack-thing for the chest piece.
A lot of cutting, and epoxy gluing later, this is what I came up with.
Still a work in progress, though.