Here's the issue:
I'm looking at a solution to connect a bunch of buildings using a mesh solution. The distances aren't that great (under 100m total), but we need to deliver a Ethernet segment to every building (8 remote buildings). The thinking was to use 1242a/g AP's with a single radio for back haul and the Ethernet port for the local LAN segment. We would use a 2112 WLC with version 7 code. All the buildings would link up to a main office, but some of the end buildings don't have line of site (hence the mesh). The 1242's would use higher gain omni antennas instead of the rubber duck style, which would also allow us to mount the antenna outside of the building. There will be no client connectivity to the wireless, on the mesh. Speaking with the local Cisco team, it does look like indoor mesh is not a common scenario. Is this all looking too hard?
Dual radios is recommended if you want to provide wireless. 802.11b (longer range) for the backhaul and 802.11a for wireless. But if you want to bridge buildings only, then single radio would be fine too.