Built this last summer for our girl's 3 rabbits - off of a picture I found on the web of a similar (but smaller) one. I drew up plans for my own version- on a scrap piece of paper and over a couple weeks worth of evenings... This is what we ended up with.
Each of the 3 living spaces have access to the runs below, as well as they each have their own nesting areas in the back (bedrooms as the girls would say). I built storage area in the peak of the roof for supplies. The two wings / runs on the sides each have access doors for the girls to go in and sit down and play with their bunnies.
It turned out great and the girls love it!
Now they are hinting at dad building a second one for 2 more bunnies they have their eyes on.... hmmmm