I have talked myself into thinking I need to store more hay inside. I am thinking a shed 60 x 100-120 x 18. I usually raise 100 to 200 acres of hay in either 5x6 rounds or 3x3x7 squares. I only have room for 35o max big squares now. Definetely need more equipment space At least room for a couple semi trailers. Here in Northeast Iowa the weather can be tough on hay. My question is would you build this building completely tight with doors and full side walls or utilize a full open sidewall with maybe 3 or 4 ft of steel at the top. Option 3 is build three sided and just have one long side with 18 ft bays completely open. I already have a 120 x 165 cement slab that has slope enough to handle moisture issues. Second question how do you guys feel about ridge vents or cupolas versus the vented ridge cap. I am concerned about condensation and don't want to make good hay only to have it spoil in storage. We sell 100% of what we raise so need to minimize the weathered looking hay. Thanks for any thoughts