Allow me to be the first to swim against the current and be unpopular opinion (as usual)...
*facepalm*
First off, too big. Looks like an eyesore to me and I am a Subaru guy. 
I saw the other thread (and that is the scoop I voted LEAST likely), and I am still REALLY completely unsure of what purpose a ram air of any sort will do for you from there at all.
You will REALLY need to be ramming some heavy air and going pretty fast to force air through all that plumbing to do anything at all for your engine bay (which will still really do nothing, so too many of us have found out, heh).
The work involved will seriously hamper any chances you have in resale.
Sorry dude, gotta say it.... rice. Just my opinion of course, but when you are embedded in the Subaru show/autoX community as much as I am, you see some absurd stuff (that even makes your project look golden).
Don't mean to pi55 on your picnic, but sometime ssome wisdom can be found in various opinions, heh.
Gary Noonan
'01 S/C VX / '18 Forester XT