Can't wait to see this one in action! Also, i'd suggest making the legs just fold out and down, then split in 3 parts to form knees and a foot. It would look less ridiculous, and look more "slow moving". Other then that, this reminds me of a Go-Bots rocklord or something. Inspiration? Coincidence? Also, it looks like a dinosaur with that head.
This is so awesome, I especially like how the thumbs are also folded in to make it fit in the robot.
You might want to look at the pelvis and how the legs are coming out of it though, the hole for it is projected out of the sides but the leg is going straight down. It makes it look like he's bow-legged and his thighs will grind on his pelvis whenever he walks.
obviously they'll be facing the screen when attached to a wall, when they jump out and transform they'll turn to face you probably be angled similary to this picture just to show off their design a bit more