Along those lines, see the kit I just released for creating your own do-it-yourself planner kit. Post is here: http://www.davidco.com/forum/showthread.php?t=3850
I'd be *VERY* interested in what you die-hard GTD fans think of the system. Although it was chiefly inspired by GTD, I've tried to make it partly "organisationally agnostic" so it can be configured however anybody wants. I use GTD every day, but have allowed a few non-canonical forms to creep into the mix, since it suits the way I work. One of the wonderful things about Allen's system is that, as long as you keep to the basic precepts, the methodology is flexible enough to be tweaked a thousand different ways. I've tried to pay homage to that in the kit, and I hope I've succeeded.
That doesn't mean it's perfect, by any means. I welcome all suggestions, because I know that it can be a lot better. I'm also very eager to hear the ways in which others have configured their systems to allow for different circumstances and lifestyles. There's a rather large handbook that accompanies it, and I'd love to include some more ideas for those people looking for GTD inspiration....
all my best,