Step 4: Make a box

Picture of Make a box
Make a box out of the foam board using the packing tape, which when complete will be 2 times as deep as your clay figure is thick and have at least a 1 1/2" border around it limbs when out stretched.

In the case of Gromit the dimensions were 8" deep, 12" long and 8" wide.

When, you have made your box, make sure the seams are water tight (use packaging tape to line all the corners) and then line the bottom with about 1 1/2" deep of squished 'pellets' of clay.
Very nice. I am currently making a stop motion with lego characters.