But it is also my belief that your PT-40 would be perfectly flyable, it takes ALOT to make a trainer unflyable. And 1 pound of weight added is nothing for a trainer (my first PT-40 needed three D-batteries under the tank to level it), the .46 Magnum (or even the engine in the Sportster) will be enough power to handle that. It will be quite a while before you get to the Sportster, and it is very easy to pull the engine out. If you can not take the engine off from the mount, then you can easily remove the entire mount from the firewall.

My concern is you state that the stab is not lined up proper with the wing, that could cause some problem. If you don't fly the PT-40 what are your plans for it? The cash, time and effort you put into it, to do nothing with it in the end. If you decide not to fly it I am sure there are many here who would take it off your hands, but then you lose big bucks cause you won't get back what you put into it.