2 lengths of "c" beam, 1/4" thick walls
4 pieces of 3/8" thick by 1.5" wide steel for hinge plates
2 pieces of 3/8" thick by 1.5" wide steel for hinge spacers
1 length of 1/4" wall "L" beam

Not Pictured:
Bolts for hinge and clamp
Nuts for clamp
2 pieces of 3/8" thick steel for clamp bar
3 pieces of thick walled tubing