Yeah, I tend to think you're right. But I've been surprised many times before, so it wouldn't surprise me if this wasn't the source kit. Typically, a kit is used for multiple greeblies, and so far, I haven't seen the Revell V-2 as the source kit for any other greeblie besides this one piece. And it has a LOT of awesome-looking greeblies.
So here's a question, for anyone who has built models beyond the Y-Wing, Millennium Falcon, and X-wing: do you KNOW of any other confirmed donors that come from the Revell V-2 and that are used on other ILM props? And if so, which props, and using which parts from the V-2?