Not sure that we are talking about the same thing here...Hootens is making the corner brackets as specked out on the website for $45 each. I priced the sheet steel and the steel alone is nearly that. These brackets are 32" x 20" 3/16th thick steel bent in the middle to a 90% angle and then 8 holes drilled in them and a 2" x 20" piece of pipe welded to the corner. These things are extremely stout. If you shop I think you will find this to be a great deal.
