Roxul Mineral wool boards are more readily available where you are and are just as effective. A pair of the Roxul 2" 60 or 80 boards would have a decent coefficient of acoustical absorption. I'm sure your brother can access those more easily.

I managed to find some special order roxul 12 boards that I used to build my bass traps and acoustical panels though the 80s and 60s are also very effective . You might also find it easier to use these great bags for professional looking results.

http://www.readyacoustics.com/index.php?go=products.products&cat=10

John