Most giant hoods are built large enough so a) the raptor has clearance on all sides, head and tail, and b) can turn around on the perch. This typically means around a 18" footprint and whatever height is necessary. A giant hood should have airvents near the base, and a method of securing the leash so that if the raptor flies out when the door is opened, it will remain under the falconer's control. Some falconers in warm areas add muffin fans connected to the 12V in the hawkmobile for better circulation. Handles help as well. Kimsey and Hodge's _Falconry Equipment_ has several good descriptions of giant hoods.

Giant hoods can be made of wood, cardboard boxes, or even upended plastic trash cans. If painted, it should be a light color to deflect heat.

Most recently the Coulsens have designed a very narrow box to accommodate their cast of six Harris hawks. They are only about 10 inches wide, yet their raptors don't seem to mind. There is a plan on the web of how to build one from a single 4x8' sheet of Coroplast, a very light but sturdy plastic that is usually seen as political campaign signs and USPS mail bins. Coroplast is easily hosed clean and difficult to break.

-- Andrea Chen