Let's see if I can explain my set up.
I think my barn is 30' x 65' (aprox.). Every 9' there is a pole to hold the hay loft up, so there are two rows of poles going down the length of the barn. Right now I have 2 pens that are 9'x20' , they each have access to the outdoor run.
Here are some pics, but they aren't taken back far enough to get a good idea of the layout.
The first pen I built:
And here is the second pen I built (in two pictures):
If you look at the second picture you'll notice a wall. The pen can be divided in half when the need arises (like when they are just babies).
If you look closely at the pics, you'll see the railroad ties that hold the beams for the loft floor. Railroad ties were cheap and available.
And here is a picture of the outdoor run. Again, about 30'x65' divided up in sections so they can't rape the land.
In that pic, the rabbits are getting some exercise.
Then in one 9' x 9' section I have my quail pens:
And in another 9' x9' area I built a brooder room:
I use that room for brooding, 3 rabbits, and at the moment 4 silkies and a hospital for a one-winged rooster!
I still have a couple more 9' x 20" areas to develop. And then I still have the whole loft left to expand into!!!!