I had one that I bought from Costco, manufactured by Cosmo Products in the Northwest (Oregon, I think). It was 10' wide, by 20' long, by 20'high (in the center...pitched roof design). Very similar in design to the first picture above. It came with metal frame and a roof, 2 long sides and 1 end piece. It was absolutely indispensable for when I was doing all the bodywork on the Z. I could be out of the wind and rain and sun, while still having good ventilation when sanding filler, or spraying primer/paint. I think I paid about $180 for it and it was the best investment for sure. The only downside is that the tarps would get brittle from the elements and eventually became like eggshells and just ripped in the wind. I replaced the sides after about 2 years. If the tarp material will hold up to elements better than mine did (maybe last at least 5 years), then absolutley!!
HTH,
Tim