I'm adopting a 2nd rabbit this weekend and I'm currently working out the housing situation.  My bunny currently lives in a NIC condo, 2 grate wide, 3 long, and 3 tall.  I have the supplies to mimic this condo almost exactly for the second rabbit.  Would this be an appropriate option for housing during bonding?  Their condos will be a few inches apart side by side and the floor layouts will be almost identical.  Any issues with this setup?  I only ask because it was recommended that they be housed in pens, but with my limited space I can't make incredibly large pens, but I can easily build a 3 floor condo for each of them.