Looking at putting up a Sioux Grain Bin. It will be 48' dia. 40' eve height. It will the 44" wide coragation sheets with stiffeners. A structual 15000 lb roof. Anyone have any bad things to say about sioux bins. Top lids or access doors. There is none in my area. Does anyone have one with in an hour drive of NW corner of Iowa. I am 5 mile from MN and 50 from SD.