Aquaponic Greenhouse 2015 Review
We went from 4' centers to 2' centers for the structural design in 2016 compared to 2015. This is for easy code compliance. The speculation is that the 2015 version may pass code, but only with engineering approval.
The 2016 version window opens on a hinge, meaning that you can't use the space where the window opens. A sliding window is better, like in the 2015 version. We would have to retrofit the sliding window like in 2015 into the 2016 version to obtain the 2018 version.