Went back and had another look at the Hijacker. Now Version 4.
Like before I kept the underside flat and uncluttered so that it could attach to almost any AEGAKS frame. The limbs can be positioned to "hug" the frame, almost like it is gripping the frame.
Bigger than the 2.5, so more than likely intelligent enough to operate without external feedback.
I'm not 100% sure I like the shape though, the front limbs are too close together, may take another crack at this one.
DOH! just realised that if I turn it upside down it will fit better on the Arkham. Would look a bit better with the tail pointing down rather than up. But I'd have to split the legs all the way to the sides and position it slightly down the body.