RE: Eaa biplane
Bill,
I'm looking at my plans right now, and the c.g. is shown 4 5/8" back from the leading edge of the top wing. That's close enough to what you've already heard.
I'm looking forward to building mine, but life keeps getting in the way! I'm going electric too, but will likely use an AXI setup. I also ordered a fiberglass cowl from Fiberglass Specialties.
Good luck, Gary