I accept. I'll need some time to check the entries :)
1- ROTF Bumblebee by Commander Zylo (the coolest among the actually transformable entries)
2- Decepticon Ravage by Jonathan Pastuch (no need to say why)
It was a close call between Luis K.'s and Jason Corlett's Devatators, because one transforms but it can't stand on its own, and the other is marvellous but does not transform.
So, without further ado...
3- Devastator V2 by Jason Corlett Permalink
1st: Jason Corlett's Bumble Bee V2(I know it doesn't transform but it's really the best build)
2nd:Jason Corlett's Devastator V2
3rd:Commander Zylo's ROTF Bumblebee(Transforming action gets bonus points)
Sorry for the delay! Permalink