I fly a Goldberg Ultimate with a Webra 120 in the nose. First of all, put the servos in the tail. I did not, and have the batt in the canopy and 3 ounces of lead in the tail. It's on the Re-Do list for this winter. I'm thinking about using only 2 servos in the tail however, to avoid any possibility of differential throw. I'll probably use a Sig offset control horn to do so. The 120 with a 16x6 APC is a blast! Everything happens at 1/2 throttle or less. I can't imagine more fun with a plane. Put a piece or two of tri stock in the tank compartment as the Webra is a shaker. Also, look at where the cabane attaches to the fuselage. The kit puts 4-40 bolts into light ply there. You may want to add some hard birch ply plates there and use slightly longer bolts. Buy a Bisson Muffler and cut 1/2 of an inch off of the exhaust pipes, you won't regret it! I gained about 300 RPM on top, and lots of throttle response. It's a bit louder, but nobody has mentioned it at my field. I can tell, but I don't think anybody else noticed.
Good luck, and look foreward to it!