RE: Aerobatic biplane.
Buy a set of the Bucker Jungmann plans from Goldberg and scratchbuild one with balsa fuse instead of ply. It should come in below 9lb if done right and is an excellent aerobatic design, much better than the typical Ultimate bipe.
mcmike, not bashing your choice, I am thinking of the typical full fuse Ultimate like the Goldberg 10-300 kit and similar aircraft. The profiles are different beasts altogether.
Mark