I can see you have gone to some trouble with the power delivery. It is unusual for models of this era to have vertical performance, some of them weighing 10 pounds. My landing gear is near 40 years old, and I no longer trust the seals to hold air. The replacement pneumatic tube was a poor fit on the nipples, so I had to limit pressure to 50 psi. To make the airplane as usable as my Aeromaster (or yours) will require a new gear, and some lightening, because I had to add nose weight to balance. A heavier more powerful engine would be the answer if it would fit in the tight space. In the mean time, I just enjoy looking at it.