Solar Kiln for drying lumber

I am fortunate to have a small sawmill for cutting my own lumber.   We have mostly Fir trees but also some occasional access to Cedar, Maple, Ash, Walnut, etc. provided by generous friends and neighbors, almost always the result of storm damage.    The downside has always been the one to three years drying time for the lumber.   I built this kiln to hopefully reduce that time to a few months,  we will see.   Plans, such as they were, came online from the Virginia State University website.    the plans were more of an idea that a blueprint so some innovating had to happen.  I opted for a concrete slab for a base rather than the PT wood they recommended. Air is circulated via three small solar fans that seem to work well so long as the sun is shining, that is not a sure thing in our climate.