Not only is that a great recipe, I also love the way it's written!

I checked this against my recipe, and it's exactly 1/2 of what I make in a 9x13 pan, or two rounds.
It's a great recipe, but I've never tried combining that way.
I mix dry and wet separately and then combine. I think I'd worry about everything mixing well.
Anyway, the secret is having the pans greased and oven preheated so the soda/vinegar is still reacting.