Brian, I had a 30 x 40 x 10 built about 3 1/2 yrs ago. Standard was 10' centers, get 8' will work out much better for interior framing. The crew that erected it for me had the kit delivered 1 wk before they were ready to start, showed up about 4:30 or 5:00 one evening, layed out the holes for the poles, drilled them, and layed out materials for next day. They begain work at 6:00am, and handed me the keys to the side door, had cleaned up and were gone by 4:30! These guys were good! I checked everything for square and WOW! it is better than my house! They even string line the screws! It took the concrete man about 2 days to level and pour the slab, even with lite showers the day of the pour, all work was inside and dry. Now how long it has taken me to get it half way insulated and wired is another story! I've probably less than 14 grand in it and I would recomind it to any one.