i made a homemade cage with 1/2"x1" wire (18g i think? not as thick as i'd like but my housebun is a lionhead so it's fine,) from tractor supply and an under-bed plastic bin with good dimensions. my problem with pretty much every prefab rabbit cage is they only have one of two floors -
one like this, where the rabbit sits in the litter, getting gross and requiring more cleaning than i want to do:
or like this, where the rabbit is on wire, but the "litter" pan is incredibly shallow and at least in the case of my rabbit, he will pee in the corners (as they usually do) and it will just shoot out on the floor.
neither of these were gonna work for me. so i built my own with wire and j-clips and a couple zipties for areas that were hard to reach.
this is apparently the only photo i have of it before i went and got more j-clips
the container kind of opens at an angle (so you can stack them,) so the cage sinks down about three inches or so. this way he's up off the litter, keeping him clean, with 'pee guards' keeping everything contained.
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it's not beautiful but it's so far the best thing ever for us haha. i could probably remake it and make it look nice, but considering how dry my hands were afterwards, i'll wait til it falls apart first haha. the dimensions are something like 27" long and i think 18" wide, so it's a decent size for a rabbit his size to just stay in, but he does have a "play pen" area he can access 24/7 that is just one of those open puppy kennel things. i would go for one of those if you want a play area. they're really heavy so they aren't easily moved. my little guy doesn't even try, but i have a couple of my larger rabbits that will push it, but that depends on your bun haha. but generally the heavier the better.