So I have a small prefab coop (I know, I know, we're city slickers) which is working fine at the moment, but thanks to Chicken Math I ended up with 4 birds instead of 3, and as they keep maturing (they're 13 weeks now) I worry that roost bar space is going to become an issue. They're all good with crowding up there right now but I'd rather give them more space if at all possible. My idea was to replace the existing roost bar with one that runs from front to back of the coop, which should give them 1 more bird's worth of space, but that means removing the built-in next box where the roost bar currently ends at. That's the easy part, if I can figure out how to cut wood haha. So my questions are: 1) Does the next box actually have to be in the coop? I'm assuming yes, but I have a nice, small dog house that was left on the property that I was thinking could be recycled as a nest box. The dog house is 14"x25" with a fully removable roof, of course I could close off some of the excess space inside to make it cozier. 1a) Would it be too crazy to attach the dog house to the coop, if that's a valid nest box option as long as it's part of the coop? I was thinking I could cut some of the welded wire at the back of the coop's mini run area, and just make a short tunnel leading to the dog house. 2) Will the girls use a nest box that's sitting at ground level, or do they prefer ones that are off the ground a bit? I see plastic ones on the review pages that are meant to be tacked up but also plywood ones that look like they could just sit on the ground. The dog house would have to be at ground level. Of course I also need to keep in mind accessibility, since the egg access hatch will only open up to the roost bar section once I do my tweak.