My daughter bought one of those kits. Dh and I put the thing together. What a waste. 10x10 proved to be 10x9'6 and there wasn't a single 2x4 in it. All the woods were second grade, no true cuts and the walls were a cheap 1/2" paneling. By the time we added the drip edge and roofing she had spent enough to make up for building from scratch. Do the job right or don't do it at all. You may not like the lay out of money in the beginning but the finished product will hold up much better. You'll be happier in the long run.