This is an awesome project. Thank you.

 I would like to add something I noticed.   

   I was looking at my S1 boards and my BTCGarden board.  They are pretty much the same thing. There are a few more capacitors around the chips on the BTC Garden, (that probably is there to handle the extra power they put through.), but my question is this. Why is there a central FPGA? I would understand if it was using the board as its own control, but it is running network and cgminer through a RaspBerryPi. It uses half the chips of the S1 and gets about double it's hashrate. I am presuming the kicker is the FPGA.
So...if we hook-up an S1 Board to and FPGA board and run it through that and reversing the cgminer that BTCGarden is using..could we possibly quadruple the hashrate of the S1?

(Ie:  If the BTC Garden runs 1 board at 155Ghash with 16 chips and an FPGA...would it not go to assume that 1 Board of S1 with 32 chips and FPGA would go about 4 x 85Ghash or 340Ghash?)

BTW: BTC Garden is using an Altera Cyclone IV chip.