Dan you'd be better phoning Mardave directly on the number on the website.
You'll pretty certainly speak to Chris himself and yes,that bulge/airscoop is on the shell I bought a few weeks ago,but I always thought that was on the original late 80's shell.
The newer kit shells don't have it(like your black'un).
Here's a couple of WIP shots of where I'm at with my Cobeor(soon to be a lot more of a Cobra)
I think I goofed by painting the faces of the scoops black,thinking of
cleaning the black off and either opening them up or blowing them
in with Tamiya Smoke.
I've yet to do the black window surrounds and the "fixing pin" silver dots
on the windows.
BTW,anyone adapted a slipper clutch to fit the Cobra's layshaft/spur gear?
That is one cute shell Jase.
Eddie PM me your home e-mail addy and I'll pass it onto the bloke.
Mark