Are you still working on this? I added motors and LEDs/fiber optics to my 1/35 Blackhawk and it went great.
In the tail, I used a pager motor (per the article here on FS), and a CD player motor for the main rotor. The tail rotor spins terrific; the main rotor won't lift anything, but it looks great. I ran the main rotor wires through a detailed ceiling someone else had created for their fantastic "Wolcott's Bird AH-60" over in the Helicopter forum. They blended right in (with a little paint) as standard issue electronics.
I rigged up 3 LEDs to a slow flashing circuit like this: http://www.starshipmodeler.com/tech/cj_blink.htm, and ran fiber optics to the cockpit and a couple of the nav lights. Totally awesome, if I do say so myself.
I stuck the circuit, LEDs, and batteries into the tail behind that rear wall. I didn't glue that piece in so I could replace batteries as necessary - it's attached to a tiny bit of strategically placed velcro.
Cool huh?
If I had it all to do over again (maybe), I'd definitely rig it up to have external power. Maybe wires running into a base, like through the struts/tires. Something.