No, I would not. You see, you have chosen very bad time to enter ASIC market.
Although now you specifications look amazing, in December and January a lot of new companies will start to deliver their devices. Difficulty at that time will go up, up to ten times more than current. And any ROI prognoses with current increase rate will be wrong starting from year 2014. Your device delivery in April is so late, and so far away, that risk is very high. Your offer will be accepted only by guys with big pockets, who invest into everything that possibly can mine.

My background - I am just watching hardware forum for half a year now, trying to follow any related news.