LemonJello, the Italeri kit is based on the prototype and isn't all that accurate. I'm no Cobra expert but looks like Italeri took the W mold and added some parts to make it a Z. To me it looks like a Z and I'm quite happy with it.
The fit is ok, although I didn't like the way the front fuselage top bits (not sure what to call them) get added, leaves nasty gaps. My main rotor didn't survive for very long, it wasn't holding the wait of the 4 blades. I added toothpicks above and below to support it, hence my main rotor section looks quite funny.
If you want I can take some pics of my finished model and then the experts can point out what Italeri got wrong?
Just remember, I built the kit rapidly as a fun build and didn't bother to fill the gaps as well as I could.