Pool/Donjon Hybrid for D&Ders ?

Not sure where to put this� Short-but-intense-time lurker, first-time poster� etc. And I do tend to ramble.

I'm new at this Narrativist thing - actually, I think I've always been a closet Narrativist -- but I think I want to try it out. I put in an order for Sorcerer at the FLGS, but while I wait, I was reading here, and got to thinking�

I think I could tempt my group (of casual D&Ders) into a night of creative-juices-flowing, shared-authorship fun with a Pool/Donjon hybrid. Use Donjon's sense of implied setting/premise/goal, with the rules-lite feel of The Pool. They are all gaming enthusiasts of one stripe or another, and they've followed me on a few D&D distractions in the past, but nothing quite as radical as letting players directly participate in a game. (I, not entirely knowing what I was doing, tried to do that with the last game of D&D I tried to run with them. It flopped initially, but after a few months with the characters, ended in a big moment of "now you take the wheel".)

Since I'm new to Narrativism, I was hoping one of the brighter spots here might could help me avoid walking into any gaping pits with this� here's what I'm thinking:

-   The set-up will be mostly old-skool D&D: You are going to explore a dungeon. I will describe the initial dungeon set-up (the "quest").

-   Players will describe their characters. Other players call out the Traits from the description, you pick a handful from these. I'm thinking of using high-roll on dice to determine who goes first (whether it's better to go first or not�?)

-   Use Donjon style "I go looking for a {fact} over here, in this manner" intent descriptions, but Pool-style dicing, with a twist (did I get this from descriptions of octaNe ?) - Roll 1 "free" die, plus one for an applicable trait, plus a number of gambled dice from the pool, plus any gifts from fellow players, plus 1 or more GM dice (of a separate color). Each non-GM-die success is a "fact" that player gets to narrate into the world; each GM-die success is a "fact" that I get to narrate (presumably something antagonist to the players' interests).

-   Use the "Yes, but" rule from improv/Robin Laws (http://www.dyingearth.com/pagexxaugust.htm) - players can augmnent established facts, but cannot directly negate anything.

There's some parts I'm not sure about (I see this being a big, risky experiment) but this sounds like the kind of game I'd like to be a player in, anyway. As I'm intending to GM it, I imagine my primary role being to 1) kick off the basic premise (it's a dungeon); 2) steer things back on track occasionally/potentially (if things stall out) and 3) decide to abort if no one's having any fun.