So! Did you get it finished???
If you are still thinking, might I suggest that the borders that make your quilt a "queen-sized" quilt can be up to 20" wide, since this is the part that hangs over the bed (at least that is what Eleanor Burns says ...) ...
I am betting that when it is all said and done, it will be a bit like giving birth ... a pain in the neck while going through it, but so proud of the results, you will jump into your next quilt faster than ever! <wave>