Hi Ted:
I made one from Plastic kitchen cutting board bought from Home depot. Cuts well with a bandsaw. Like cutting butter. Cut T shaped piece with the top of the T against the back of the motor. 5/16 by 1/2 and 2 in. long. the motor mount on mine has 4 lugs. so glued 2 pieces to the sides to accomedate the other two lugs screwed into the plastic with short sheet metal screws. Two 4-40 Allen bolts bolt it to the sides of the foam faced with 1/64 plywood. May be able to make a picture if I can get the camera to work. Hope this helps.