I would be interested in something like this if it can handle many units (up to 50) and is relatively easy to use. Have you started the web frontend?
the webinterface is currently just a basic html form to set the target data and show the stats of the last 5 minutes(shares/accepted/stale/estimated hashrate). looks really ugly, but I just made it for monitoring.
I currently do only have one BFL unit for testing with me, as soon as I get the others local I will add them too. Right now it works as plug and play:
Add a unit, it gets detected within a minute and starts mining with the preconfigured data(webif).
In theory it should be possible to drive about 100-120 units with this device(usb length limit to 127, subtract some for usb hubs).
Assuming it's preconfigured and easy to use I'd be interested in such a project, esp. if it can be bought with BTC.
I will accept bitcoin for sure. as written above, plug it into the wall, connect the BFL, go to the web if and set your RPC credentials+host, on you go.
The catch is that right now I can only confirm that it'll work with BFLs, since I dont have any other FPGA platforms.