I just bought the bella plan, and it seems simple enough to build. I dont get some of the lingo used, but im not a builder, my mother who has done some light carpentry in the past got what they were talking about, and we just plain like the look of it compared to other places designs, so to us, the extra building costs are worth it because we want something that looks nice, and adds value to the property and not just some blah, or ugly thing that will need constant fixing and repair.
We're also saving because we're going to be using left over shingles from when we redid the roof and paint from when we repainted the house.