Wow, I build 3,720 kh/s rigs all day long for under $2,500...Come on people, think wisely before you spend your money.
spec and price it, and I'll build mine that way.
You can figure that out yourself, not going to help the competition

Just letting everyone know that you can be more efficient.
I'm sure a rig with that capacity could be built for that price, no question there, but could it be built, tested, and shipped with a small margin of profit.
The answer: No. It can't.