The way to end up with a light model is to take a total approach to the problem. Examine every piece of wood in the kit and throw out the hard stuff. Replace lite-ply with balsa, if feasible. Look at the weight of the engine- 2 stroke is lighter than 4-stroke and plain bushing is lighter than ball-bearing. Minimize the amount of glue used, especially epoxy. Choose light wheels. Don't use heavy fabric covering. Go for the smallest size servos that can be used. Get a smaller than standard receiver. Use a 250mah nicad pack instead of a 600mah pack. Even a wood prop may be lighter than a plastic prop. Position components carefully to balance the model without having to add lead ballast.