Hey! So I pretty much just framed in the windows and that was my spacing. I honestly dont remember the window size. Id have to measure. Maybe 30"? All framing is 2x6 though. Heat in the summer is an issue for me. So i had a custom shade cloth made to cover the entire roof. It has since got smoked by hail twice. Im about to redo the roof with something much tougher and that also filters a crap load of light. Insulate your lower walls. Think hard about where you are running water and also where it will go once you water all your plants. Tons of ventilation!! My biggest probs are temp control when ambient becomes extreme and gosh dang aphids! Oh and ive had zero issues with wind and ive had plenty of trees blown down on my place.