RE: Biplanes
The Goldberg is now laser cut too. It is available as an ARF too for those with time restrictions. I once built the kit, and have owned two ARFs. The Ultimate is one heck of a plane. Fly it with a 91FX or better, but keep it light. Anything over a 25 ounce engine, you will want servos moved to the back to balance.
The Sig Hog Bipe sure is a classy looking plane. I've never flown one.