Notice that they've made both a 5-foot Mark I style kite, and the larger 7-foot Mark II type. The Mark II has the twin-engine "Betty" bomber silhouette. They used 1.5 ounce ripstop nylon. Their website has a brief description of actually flying the kites as well. They both sound like quite a handful to fly.
Thanks again to Bob & Charmayne for sharing their photos.