does this sound right (turbo sizing)

[dannyho]

I've been doing this correctly, i think. and I've been comparing turbo maps to what I think my engine requirements will be and it seems I've founda great match, but as a engineering student i've been trained to find the answer using numbers, then step back and ask if it "sounds right".
essentially what i've come up with is that a turbo from a 2.0 liter engine with a 7000+ redline that is reputed to be capable of just under 300 Hp, would but nearly perfect for use in a twin setup for a 5.2L engine with a <6000 redline. I'm probably not looking to boost that high (less than 12 psi at most), no more than 550 hp, probably more like 450. so does that sound right to you guys?
I'll post a picture of the flow map with my estimated requirements overlayed.