My impression so far is that if we build this, it would be significant enough that miners would really go for it.
I'll humor you.
This is your competition.
http://bitcointalk.org/index.php?topic=40058.0 180 MH/s, 15 watts, $610.
Yours, 750 MH/s, 15 watts, $370 plus markup, let's say $610.
You are claiming more than 4x the price/performance level. They have several dozen people who put down money for pre-orders. You would sell hundreds, easy, if you could produce them. But you won't, because you're either scamming on purpose, or you've miscalulated ... a lot. It is, without a doubt, too good to be true.