Well. See what happens when I don't check for new messages? Here are some thoughts in no particular order.
I'm glad to hear that Rod is taking matters into his own hands, to get his products out. I've enjoyed reading the book and hope to run a game soon.
I prefer a stand-alone book, rather than a supplement. I approve Rod's comment that the base system he goes with should bend to match the first edition of CF. I haven't used any of the systems you've mentioned. However I'm a huge fan of Chaosium's RQ2, and of Call of Cthulhu. My leanings are towards stripped-down rules systems, rather than crunch. For the same reason I prefer a stand-alone book: I want to roll some dice and get on with the game, not get bogged down. So in fact I'm more in favor of stripping down my preferred system, RQ2, to something on a par with CoC. If it's a stand-alone book, does it really need to be associated with an existing system? BTW I applaud Vile for his SRD-thing, for emulating RQ2.
I've played RQ2 since back in the earliest days, and consider it old-school by definition. That's the feel I enjoy, and I would think you could get some additional interest among we older gamers who are looking to relive the old days. I'm a hardcover guy, so I'd be looking for a printed book.
From all the other comments I've read here, it sounds to me like if you're going to associate yourself with something, Openquest might be a good match for you.
IAC, I wish you success and hope to follow developments. Thanks for everything, Rod.