While I don't have any photos, I found this one on the internet showing him combined:
http://3.bp.blogspot.com/-IA8jEaMhGS...0/P2150979.JPG
While it is easy to put both the Front and middle parts on the arms, they are very loose and aren't exactly the same as Armada Megatron, while the pack part is held on by the back 2 mini-con ports:
http://4.bp.blogspot.com/-sb6jyW8mmt...0/P2150984.JPG
However that isn't exactly easy and is still very loose. It's kinda funny knowing this (And this also works on the other megatron as well so yay)