Thank goodness I got the Snap and Grow instead of the more tradionally hardware built greenhouses. With the 8x20, there was a bit of a learning curve on stabilizing the roof (put the roof braces onto the side walls first and have one person hold each side of the roof beam while the other secures those braces, trust me)- but it was considerably easier than fighting with hardware. The panels look fantastic, and are crystal clear. I have just a bit of work left to do to put it together, and Ill be able to get plants out of my kitchen! For the 8x20, I have about 14 hours in on assembly- BUT of those I only had an extra set of hands for the roof assembly. Two people could probably have it done considerably faster. So far, very pleased- and the built in gutter was an unexpected bonus!