I have an AFrame just like that for my duck run! I LOVE that I can stand up inside it. Also you were asking about closing the door without going in the run. With my chicken coop I essentially have a string on my door that leads to the outside, so I can just pull the door shut without going in the run, then latch it from the outside. If you add an apron to your run it looks like it will be quite secure and you may not need to lock them in their house at night (mine love to hang out in their run and party after dark).