I just replied to your prior post regarding suggestions. The smaller breeds are ones I'd steer away from. The smaller ones require lots of space because of their high energy levels. They also are the ones that can jump the highest (because of their light weight). That means they can make short work of jumping over pen walls. I'm guessing that the play yard that comes with the cage is just 24" or less in height. A small breed rabbit will jump over that with no effort.
Smaller rabbits also tend to be picked up more often which can lead to injury. Don't know if you have younger kids, but they tend to view rabbits as live stuffed animals. If the rabbit is closer to 8lbs, they are less likely to try to pick him up.
The store-bought cages tend to be expensive and not ideal either. The plastic bottoms are slippery on bunny paws which can cause legs to splay. The "upper level" is usually too small to be of any use. They come with water bottles (instead of bowls) and hay racks that are virtually useless.
BUT, there are better options!! Some people use an exercise pen as the cage itself. That's a simple option that provides more space (and costs less). Cages made from grid shelves are another option (and itself could be a constructive homeschool project). These can be made to any size and used with or without an exercise pen. You can see these and other options at the following link (my website):
https://rabbitsindoors.weebly.com/housing-options.html
That page also contains a couple other links. One shows a number of different cages we had over the years (we homeschooled our kids too). And the other links to a resource page that has several links to habitat ideas and how-to's.
