They are approx 0.086 BTC per Avalon chip and €80 to assemble ten to an open source board, and €100 to assemble 20.
Chips are rated at 282 Mh/s each. Not too sure where you've got 2.0-2.5 BTC for 10 from?!
So thats €280 for 5.64 Ghash
About 700,000 chips on order?? 5.64 Ghash x 35,000 in a few months. Is that right?
No, man your addition sucks, that's just the chips as it states clearly above. Then you have 100 Euros if they decide to do the double sided boards or 160 if just the 10 chips per board, plus housing and psu. On top of which you're sending anonymous currency to people you don't know on a bulletin board to buy the chips and then have them send that to another anonymous person in another country to assemble the unit.
But then by August/September who knows what offers will be available.
One things for sure, the BFL crowd won't be making anything like they envisaged.
there won't be a housing and psu will be simple.