This is an Instructable on how to make a rocking hammock stand to recreate the sensation of floating on a long-tail boat in the Pacific. You will need
2 - 20' long, 2" x 1.5" steel tube with a wall thickness of at least .12"
1 - 3' x 4' sheet of steel .06" thick
A tube rolling machine to bend the tube
A shear to cut the sheet metal
A punch to cut holes in the sheet metal
A MiG welding machine to weld the tubes and sheet metal
A hammock (with rope)
Use a tube roller to bend the 2 tubes until the ends are 14' apart.