This picture is how the Hovercraft worked. We bought a sheet of ¾ inch plywood. Cut out a 4 foot circle.  We put plastic on the bottom and cut three holes in the plastic. Turned it face down on the floor and put an ordinary shop vacuum in the hole in the center and blew air in.  It would rise up on a cushion of air and you could move the student around to everywhere you wanted to go.  It was a lot of fun.