Forge World 'Chinork' Chopper

I just saw this little model on the Forge World site. In name and design it pays a fair homage to the real-life CH-47 Chinook twin-rotor helicopter, also pictured below. But for some reason that I can't quite put my finger on the model looks a bit off to me. It sort of looks like they slapped an over-sized platform onto the back of a Deffkopta, added another rotor, and called it good. Which is probably what real Orks would do, but I think I would prefer to see something a little more enclosed, like a Battlewagon stripped of armor or a looted Valkyrie. Any, here it is. You can follow the above link to see pictures of it from other angles.