Anyone have thoughts or advice on choosing between these? We're planning (unless I get overwhelming information that this is a bad idea) on building a shelter for our 70 white broilers, and moving it somewhere around 1x a week. The shelter/tractor will be for nighttime protection mainly, and we will have around 20x15 of 'run' space for them as we're going to divide out the run so as to give it time to recover for a few weeks while we rotate the shelter to a new section as needed. I'm also planning on planting a few things in the run besides the "grass" we have here for them to forage on. (also strongly considering doing fermented feed part-time) After pricing out the lumber and coverings (steel roof or cattle panels and plastic) it looks like it's just about even price-wise. Also, if anyone has a recommendation for a shelter size for this number, I'd love to hear it. I have a number in my head, but I'm not completely sold that it's a "correct" number. We've got a month before chicks will be here, and I'd like to have the structure underway or complete before then.