There is an entire thread here! Click the forum button at the top and find the one called housing? Or something like that. In the meantime, here's one that my son and I built for Bun Jovi. She's now a free range bun, but this worked wonderfully while he lived in a small motor home for a short time.
And here is a smaller NIC cage that I used as a temporary cage while bonding. I would only recommend this size to be used as a "home-base" cage, meaning that the door is left open all day. It would just be used to house bunny's necessities.
Yes! absolutely use zip ties and do not use the plastic connectors that come in the box. Those won't hold the cage together well enough for persistent bunnies.
Here is a tutorial, however, bear in mind that most of us made our own modifications as fit our budget or needs.