Carport using unusual construction method

I've got four Mopars and a Porsche, and I refuse to let any of them sit outside in the rain, so I keep them in my shop during the winter. Since they completely fill the shop, I can't work on any other big projects when the cars are inside.

So I am building a carport with a "shed" or "lean to" roof, supported by 6"-diameter concrete pillars which I am pouring in place using large PVC pipe as the form. It is going to be large: 28 X 22-1/2, so I will be able to keep all my cars in the carport (with car covers) and use the shop for restoration work and move my rotisserie around during the winter months. I'll also have room for my tractor and implements in the carport.

If anybody is interested in this construction technique, I can post more pictures.

concrete pillar construction.jpg