Me too - plus a couple I can't work out the wordplay to (but they seem to fit ok).
I'm really struggling with the extra letters now - I seem to have 10, not 9 and can't see any symmetry or sense (apart from a suggestion from the top 4 letters - and knowing what to expect from this author, this is what should dictate how the grid's to be completed).
From the work in question there can only be one shape - and I'd expect it to be symmetrical.