I have heard nothing but unfavorable reports regarding the Imex/Kangnam 1/35 AH-64's.
Here's an example from Jon Bernstein.
Jon knows what he's talking about. He's an active U.S. Army Apache pilot.
Ex/Kangnam AH-64 kits September 16 2006 at 8:15 PM Jon Bernstein
Response to IMEX Apache Questions
Yep, the list of inaccuracies and fixes for the 35th scale Kangnam/IMEX -64 kits is about as long as my arm. It really is just a crappy, poorly researched and poorly manufactured kit. I scrapped mine after about 30 hours of trying to fix it. Just didnt want to work. Instead, I spent as much time converting a Revell AH-64A in 32nd and got MUCH better results.
The only really accurate AH-64D kit out there is the Hasegawa 1:48th kit. For Alphas you have a bit more wiggle room, since the Monogram classic is a great kit, barring the fit issues; and the Hasegawa is even better.
Jon Bernstein