How did I miss this thread?!
Lookin good there John! That Italeri kit, even though it says "Longbow" is not a D model. It represents the APG-78 radar testbed AH-64A. The Extended Forward Avionics Bays (EFABS) are not included with that kit, and the FABs you've got on the kit are the A model ones. Unfortunately, that kit came out when the program was just getting underway. Here's a shot of the right hand EFAB on a flat-top AH-64D (that's me in the back seat). You can see it is beefier than the one that comes in the kit.
By comparison, here's an A model FAB:
There's a major difference in angles and size, and that's just the right side. The FABs on an Alpha are symmetrical, while they are considerably different on the Delta.
This is a difficult angle, but you can see that while the right side EFAB goes under the wing, the left side actually angles up to be even with the top of the wing. On the Longbow, both EFABs end in a large venting system:
Now, as far as details in the front cockpit go, Charlie had it nailed. The Block 1 AH-64D's still had the ORT (Optic Relay Tube) from the AH-64A, except with some new buttons. Block 2 (2003 builds and later) have the new TEDAC display:
Hope this helps somewhat. If you need any help, don't hesitate to email me!
Jon