One of our test boards with the new concept Cairnsmore4 and Controller1 module fitted. This board supports 16 Clusters of up to 9 Bitfury ASICs. We will talk more about the spec and pricing when we are happy with the firmware/software, thermal solution and are ready to ship. Meanwhile enjoy.
So it has 144 BF ASICs. At 22,5 eur per chip, the chip cost alone is 3240 euros without bulk discounts. If you manage to get 4 GHash/s from each chip (as burnin already has), we're looking at 576 GH/s. At maybe 4 W per chip, the full unit would be using around 600 Watts of power.
If you manage to price that competitively, I'm sure you will have sales. The pricing is what will decide if people want that or not. Time to market is essential at the moment though so don't take too long.
edit: If you manage to deliver in October, that unit should be able to mine 50-75 BTC between Oct and May, depending on, of course, how harshly the difficulty rises in the next year. That will leave some wiggle room in pricing, so if we deduct chip price, we're looking at maybe 3000-3500 euros ROI. Now you just need to decide how much you want from that 3k euros and how much the customer should get.