I had to add about 20 oz of weight to the nose. I put the battery for one of the flight packs in the radar dome (radome) and the 20 oz weight. I put a bulkhead in front of the fuselage to contain the battery and put a screw through the bulkhead. Then I molded lead to the correct shape and bolted it in. Without the nose weight it will sit on the tail,, almost anyway.

I built a cg machine like the topflite one but megga scale and used it to balance the bird to confirm the cg. I don't have specific measurements for the cg,, the machine is only accurate to about 1/2 " but this was not a big issue. When sitting on the main gear I can retract the nose wheel and the plane will still sit level so there is not enough weight to make the nose touch with the wheel up. If the nose wheel did not extend in flight I could still land on the mains with no damage to the nose. Hope this helps.. Jim