Pathfinder,
Which era are you going to have this Apache portray? It is pretty good as is for an early one, but if you're going to do a current A model, there's a TON of crap that needs to be added. If you go to my website, http://cobrahistorian.tripod.com and go to the photos page, there are two shots of "Devil's Dance" from the 1/229 ATKHB which give some good detail on antenna and wire-strike placement. "DD" was flown in Afghanistan in 2002.
I really need to update the site, but there are a few good photos there.
For a current Apache, it needs:
a chaff/flare dispenser
laser detectors (on 4 positions)
wire-strike kit (cable cutters on 6 positions and the framework around the cannon needs to be removed and re-positioned)
ECM antennae on the nose and above and aft of the canopy
windshield wipers
counterweights on the actuator frame for the m/r.
I will say, working in this scale is rather enjoyable!