They're all falling about the same size - though I expect the 2 x's will outgrow the straight guernsey a bit.
I can be set up to separate in-kids to the not in kids. We set up our barn to be common, but it is set up to allow for eventual 3 separate stalls. I know sounds strange but we built it, so put 3 doors for 3 stalls but at the moment, leave the barriers down in the stalls as there is no need to separate them. I wanted it designed this way so that if we had any in-kid on their own, they'd have their own space to sleep and eat.
The field wouldn't be though - but I didn't think that was a problem. It was more for concentrates and the ability to have her kids with her. I think I'd struggle a bit though to do 3 at one time, on many levels. The stalls whilst allowing for 3 would be less 'roomy' which can be fine but would prefer to not do 3 like that at one time. And I wouldn't really know what to do with all that milk and I am inexperienced with kidding, and would like to have a go at watching for any signs, and if there are any complications, I am too busy with one to maybe notice the other? It wouldn't be second nature to me as it would to many on here.