Cloudancer, I have installed a magnum four stroke 1.20 size, but I am sure that the weight on mine will be a lot higher than yours, if it is possible I d' like to know how does your combo perform and the final weight.
I did the simulated wood landing gear with balsa, the plane is covered with Koverall and used stix it and iron it, then I sealed with nitrate dope. The plane has gained some more weight with aditional details like William Bros. machine guns, four servo aileron setup, dummy engines with mufflers, very heavy dubro 5 1/2" wheels, improved winshield and a bit of detailing at the cockpit.
I will be shooting more pictures soon.