Make top and bottom shells with red dough. Place insulation layer in between the shells.
Create claws and legs and attach them to the lower shell of the body. (They cannot touch the top body shell).
Attach the LEDs to the body of the crab. The longer wire from each LED should go into the bottom shell, and the shorter wire will insert into the top shell.
Finally, attach the terminals from the battery holder. Insert the red terminal into the bottom shell and the black terminal into the top shell. Turn on the battery to light up the eyes on the crab!