answer for ozimmerman...the 4x4's are 8 footers buried 2 feet in the ground and cemented. I wanted to be able to walk in easily. I'm a little shy of 6 feet so it's perfect.
The harware cloth is attatched with primeguard exterior screws and washers, an idea frequently mentioned on this site. If you use screws I highly recomend a star or square drive screw.