To maximize any intercooler I most highly recommend using some ABS plastic sheet and blocking off any air from going around the IC, sides, top and bottom. It will help a great deal especially since the opening to it is so small, force more air into the areas not in the direct line of air flow, etc......
Looks good though
ABS is my preferred material, light weight, can be molded with a little heat applied, flexible enough to not damage things much in a minor hit, easy to work with, low cost. I buy it in 4'x8' sheets wholesale for $32!
I am going to post this in the performance section as it is an important real performance issue.
Good day
Rick