Follow the Sakura Tram Alterations

I have even better idea (and it's a dream too, I know): they should make entire chassis with motor and everything that we can replace if motor dies. You see, I'm no expert in motors (in fact, I do not know almost anything about motors), and what should I do if the motor stops working? In many cases I can't just buy another train, because it's not availible on the market at all. What then? The easiest way would be to buy a matching chassis with motor &tc, and put the shell body on it, no?