My son's scratch-built Slaughterspine

 My son made this beastie out of an old toy dinosaur and lots and lots of bits of cardboard. 

He's put up a video about it here:

More of my son's creations

My son made these two big beasties recently.

He scratch-built the sand monster from tinfoil and Fimo.

The robot was constructed from wire, beads and a pencil sharpener. Here, he was inspired by the amazing Bill Making Stuff YouTube channel - one of the inspirations for his own RustMonster channel.

The robot's 'mouthparts' were inspired by the helipcoprion.