Displacer beasts were large cat-like creatures, sometimes described as panther or puma-like with six legs and a pair of long tentacles sprouting from their shoulders. They were covered in a pelt of blue-black fur. They were usually about 9 feet long and weighed as much as 500 pounds, but the occasional mutant could be twice this size
Real simple.... $1 store tiger cut away front legs and apoxy them to the panther.
Wire tentacles with tooth pick spikes
citadel paints