a large x-ray
several yards of cotton clothesline
a square 4-gallon bucket[3] (The top should measure around 9 1/2″ along one edge.)
four turnbuckles
four 3/4″ corner braces
four 1″ corner braces
sixteen #8 1/2″ wood screws
sixteen #8 1″ wood screws
eight medium screw eyes (e.g., 7/8″ long screw eyes with a 1/4″ eye capable of bearing 11 pounds of pressure)
8′ of 1″×1/2″ trim wood
[3] Cat litter is commonly sold in this sort of square 4-gallon bucket. Other free sources include bakeries, since many bulk ingredients (like the nutty, cinnamon-and-sugar schmeer used on sticky buns) are shipped in these. A square bucket is preferable to a common cylindrical bucket, as a square drumhead frame is much easier to craft than a circular one.