Mike, I am also coming to the same conclusion but it is getting expensive!
I thought I just needed a canopy (broken), landing skid (snapped), motor gear (missing) and main frame (glued together). Now I have discovered a loose locking sleeve set, chewed screws, couldn't resist a new metal swash for £2.50, (!) and gear set, and it also has no charger. Add a pair of new motors to that lot and it will probably make a loss if I ever manage to sell it when it's finished!
Fortunately the receiver and servos all seem to be fine so that's a plus.
Good job I enjoy tinkering and I would still like a motor pinion if anyone can find one