funionfs on Fedora 21 with Steam games under Codeweavers Crossover

I have multiple steam accounts, each has full rights to the Borderlands games.  The problem with this setup is that each steam account has a full, multi-gigabyte common directory.  Using a single directory doesn't work as each Steam account makes some minor modifications to the downloaded files -- I'm assuming but don't know -- that this is related to copy protection.
In any case, I am exploring using funionfs to allow I big directory and several small directories for the installed games.
I name my steam bottles Steam021, Steam022, etc.

Steam021 has the unadulterated full game installation.
Under Steam022, I moved common to common.before.  Then I created common and commonrw.
Finally  I mounted the funionfs directory under Steam022 like so
sudo funionfs -o uid=1000 -o gid=1000 -o allow_other -o dirs=\"/home/gamer/.cxoffice/Steam021/drive_c/Program Files/Steam/steamapps/common"=RO:\"/home/gamer/.cxoffice/Steam022/drive_c/Program\ Files/Steam/steamapps/commonrw"=RW\ NONE "/home/gamer/.cxoffice/Steam022/drive_c/Program Files/Steam/steamapps/common"

Next I ran a Steam Verify Integrity command to see if the Steam client in Steam022 liked the fuse common/

I am hoping, but don't know that maybe I'll get some HD access  caching too since the underlying Linux  disk reads will now be for the






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