I supose Testors made their Mi-28 many moons ago, before aircraft went through dozen upgrades and modifications.
If you wanna build more or less modern Mi-28 - use last Zvezda model. I am not sure whats the name of it..... Mi-28N or something like this. Reference pics are on Primeportal.
http://images.google.ca/imgres?imgurl=http://www.zvezda.org.ru/images/sets/7255.gif&imgrefurl=http://www.zvezda.org.ru/%3Flng%3Deng%26nav%3D1%26nov%3D2%26set%3D7255&h=206&w=300&sz=20&hl=en&start=2&tbnid=jH4_utNQugrZnM:&tbnh=80&tbnw=116&prev=/images%3Fq%3Dzvezda%2BMi-28n%26svnum%3D10%26hl%3Den%26lr%3D
Good luck
Andy