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What happened in the end Mike?
After about 6 hours of trying every RAID config possible and installing FreeBSD onto a spare drive so I could at least boot the system and get access to the raw drives I got it working again. The root partition seems to be trashed beyond repair, but the usr partition which is the one I cared about has been recovered.
The trick was not only recreating the RAID as described in their FAQ, but also having the drives attached to the same controller channels as they where when the RAID was created. A year or two ago I moved the RAID into a new box and the drives where apparently not connected to the same channels as when I originally created the array. For the stripes to match up I had to get them back to the original config. A hint about that in their FAQ would have saved me a few hours 
-Mike