I've mentioned before that I'm not really an outline writer; I discover the story through writing.
That probably goes double with trying to come up with a proposal.
I believe that a book should be judged by it's final version, that every version before that will probably be lacking, more or less. Often I come up with some of the best bits in a book at the last moment, sometimes I finalize the "voice" in the final version, making it consistent all the way through the book.
So this proposal I've come up with for the mainstream publisher is probably no better than half as good as it will end up being.
In other words, the "100 Kickass pages" isn't really possible for me.
My instincts are, given the current version, that the final book will be just fine, but it won't look fine until it's done.
So why don't I write the complete book and then send it off? Because my intuition is that I don't have that much time. Plus, I have other commitments.
On the other hand, I might be burning bridges by sending something off that is not as good as it will be.
I'm going to work on this for the next few days, and then decide what to do.
6 days ago