Probably had a plywood backing plate, no wood in the hull.. I had a knot meter just like it.. the paddle wheel gets jammed with algae, that's the downside. But it doesn't need external power from a battery.
Yeah I believe the prop is good, don't see any damage the twist is good and that makes me wonder how the pin broke.
In any case, if the motor runs well you have to replace the pump impeller and then you will get more than your asking for!
The space between the outer hull and the inner lining will need to be made stable. If there is a rotten core all the work you put into rebeding the ports will be wasted.so be sure you have something solid between them. And have fun..:)
Geez, I just can't get a break. Now looks like I may need an impeller since it's not peeing at low revs anymore.
Don't despair, it's a learning experience..:)