Nice idea. I would be interested in buying such a thing. Every week earlier this is ready is money, so we need to speed up i guess.

I'm no expert though.. Do you have some pieces in mind? I would guess that maybe some "cheap" sha256 chips exist, although hard to find?

Edit: Searched a bit for modular fpga units and found this at ebay http://cgi.ebay.com/XILINX-XCV1000-4BG560C-FPGA-Virtex-LOT-60-PIECES-/170507774436 Too bad I don't know the fpga-scene at all...