THE BEST rabbit website is binkybuny.com. I have learned SO much from them, and got lots of ideas AND they have a super cool store. At the store I got Bambi and Cinnamon a fun bun-cave. They sent a little bag of treats as a free gift.
It was easy to put together. It's two levels, but I only made it one. I figured they would use the 2nd level to escape.