After spending way too much time searching for a Stencil for the Drobo B1200i I finally gave in and created one myself.
You can download a copy of the Drobo.vss file here: http://1drv.ms/1cHycKv
This stencil includes a Front View of the Drobo B1200i Rack Mount iSCSI disk array with cover on, and a back view also with Fan cover on. 
Both the Front and Back views includes these Shape Data Elements:
On the back of the unit I’ve included connection points on each of the Power Supplies, and each Network Adapter port: 
If you find these shapes useful, leave a comment below.
Darren Myher's Blog 
This is great thank you for creating it!
Darren, thanks for sharing this! I spent the last five minutes looking for one .I went to VisioCafe, but nothing there. I need one for our B800fs. What you’ve created will work perfectly!
Greg