Nice start to a huge Pole Barn. I did this a while ago for a Motor Home we had purchased to keep out of the weather. It started off as just a pole building carport made of 6x6 post and 8x10 beams all the way around with engineered trusses and 3 tab roofing to top it off. I ended up pouring a floor after 6months and then this last summer filled in the blanks to make a 20x42 Garage with 12 foot ceilings. I have to put power out there still, but it has doors, windows and locks to keep the thieves out. The nice part about doing it the way we did mine is that I can cut it completely in 1/4's and it will still be standing.