MOC. Built January the 21th-22nd, 2015.
The challenge was to use ONLY & EXCLUSIVELY the Lego movie set 70813 "Rescue Reinforcements" and ONLY the pieces of the fire mech (bags 1,2 and 3).
So please keep in mind that my options were limited.
My inspirations were the Transformers Inferno from Generation 1, his Classics/Universe version, and the TF3 movie Sentinel Prime.
The vehicle mode is a big fire truck with a ladder (360 degrees of rotation and goes up and down).
Thanks to the good amount of joints the robot is well poseable.
It doesn't have an head because is driven by a pilot sitting in the cabin (enough room inside for a minifigure).
The transformation is simple and relatively fast.
All the steps here.
http://www.mocpages.com/moc.php/405126