I saw the same video. The guy who was building my coop wouldn't build the doors quite large enough to open the whole side. The guy is retired and worked for free because he's a friend, so I couldn't argue too much. I have a foot on each side of the door. I don't have a wheel barrow but I...
Remember you need lots of ventilation with the coop. The upper vents can be big but make sure your roosts are lower than the vents so that no cold breeze blows on the birds during winter. I have my vents tucked under the eaves so they don't get much wind and get no rain. Unlike beb444 I don't...