At six months, smaller breeds are considered full grown.
All of my rabbits have wire-floored cages. Some of my Mini Rex do have issues with the wire (Rex-coated rabbits frequently have thinner fur on the bottoms of their feet). I use a large ceramic floor tile as a sitting board on their cages. It gives their feet a break from the wire, and is easily removed for cleaning.
Oh, I forgot, I also put hay on there to play, eat and walk on. My bunnies' feet look really good. I bought one of those grabbers from Lowes to pull out the hay when I clean the hutch (because the hutch is so big).
I have a large outdoor hutch with a wire bottom but I also have 2 tiles in there and a 4" inside wood edge that they like, too. A little bit of all worlds and easy to clean.
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