John,
I bought the fittings, tarp and bungies from creativeshelters.com. They have a design feature on the site that lets you create a "kit" that meets your desired shelter dimensions and configuration, then gives a diagram and cut list for the metal fence tubing that you will buy from a local fencing company. My local fence company cut each piece to exact size for me. There are many choices on the site for different tarps, and different configurations. The shelter I created is a 16' x 30', made with the largest/heaviest fittings/tubing (1 7/8"), with the medium gable peak (110 deg slope, 4" rise/foot), and the heaviest/most sunblocking gray tarp.
I'm happy with the quality of the finished tent, and expect the tarp and bungies to need replacement between 5-10 years. However, it was a bear to assemble because of the extreme weight...four big men had quite a struggle. I strongly prefer a metal carport type structure, but the zoning restriction would not allow it. In hindsight I actually wish I would have ignored the zoning and built the metal structure and taken the 5% chance that anyone would have noticed or cared.
Ann