I have not weighed mine yet, but I don't think I've added any appreciable weight.

I used balsa wood for reinfording the landing gear mount and the landing gear I used weighs less than the stock one. It is also more flexible.

I thought about using a wire landing gear, but have not tried one yet. Mine is doing quite well.

With the 4S 3500 li-po pushed all the way back, it balances a little tail heavy which I like for the 3D stuff. It also floats in for landings, so have not had any rough landings yet.