Thank you!There are quite a few NIC cages on this thread -- as well as some good combo cages that combine NIC with ex-pen or crate with ex-pen:
https://www.rabbitsonline.net/threads/2018-cages.88690/
2 grids by a minimum of 4 or 5 grids is a place to start. If you try to go 3 grids deep, it can make it difficult to clean or reach to the back - unless you have long elastic arms! Also, if you don't close the top, remember most rabbits can jump over the height of 2 grids.
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