Proposal is done!
As with the query letter, everyone has a somewhat different idea of how to make a proposal, what should go in it, and what a publisher wants to see. One suggestion that I didn't take was a chapter-by-chapter breakdown. Not unfeasible for my book, which has 19 chapters and a prologue, but I've known some writers who use very short chapters and rack 'em up by the dozens. If someone really wants to see such a breakdown, I'll write it.
So I've got more to do, but for now, I can enjoy the sweet feeling of accomplishment. Now let's hope it's an effective proposal...