I have an old 5000 bushel butler bin on my acreage that hasn't been used in 10-15 years according to the previous owner. It's just a govt bin, no drying floor and I would like to use it to store fire wood in it. I have cut a door out of the corrugated steel, 5'x3' and now am in the brainstorming stage as to how best to frame the door into it. I plan to just build a door from 2x4's and heavy hardware cloth to keep the critters out but allow some air flow. So I'm wondering has anyone on here done it or seen it done? I'm trying to figure out the best way to frame 2x4's over the steel opening and am looking for suggestions. I appreciate any input. Thanks.