Micheal's Craft Stores has foam sheets great for making foam gliders to just about anything you can imagine. One thing, when making foam gliders, take a round dowel on the leading edge of the wings and just back a 1/64th on a inch, flatten the leading edge. This causes the wing to cut through the air, not push it around, and with a slight wing foil shape, greater where it meats the body, it will lessen towards the tip. If you make the side profile of the wing's shaped into a slight (sideways "S"), you can get spectacular flights. Airplanes do not scale up and smaller ones have different characteristics.