Hi Amanda,
Thank you so much for commenting on our lovely boy.
There are a wide variety of different accommodations that you might choose for indoors. We don't ask for the 50sqft indoors, however, we do ask for a reasonable sized area for the bunnies living in it.
Options we might suggest would be a 48inch dog crate with shelving and maybe a puppy pen attached, NIC grid cubes, which can be build into accommodation to fit any sort of area, a puppy pen or two joined up (depending on the size of the bunnies it houses). Some people choose to turn rooms over to bunnies, but we also appreciate this is more uncommon than it is common. Any accommodation inside would need to be significantly bigger than what your bunny currently lives in though, for a variety of reasons.
This might be of use to you.
http://flashsplace.webs.com/accommodation.htm
We have lots of lovely male bunnies available for adoption. Parsnip, however, we have discovered is highly destructive and would not make the best indoor bunny for your average home. We would probably only rehome him as an indoor rabbit to a specific rabbit room due to his potential to destroy everything and how challenging that could be for whoever adopted him.
I hope that helps, and if you have any questions, please don't hesitate to contact us further and we'll help in any way we can.