Here one on rebuilding a wagon, I know they are real ones but you can get good ideas "Engles Coach Shop" is good videos an has several parts an rebuilding an building wagons.
https://youtu.be/zWlSXV3A0EM

https://youtu.be/sldK65_HUgc rubber tires on carriage wheels
https://youtu.be/3zAmb70yvtI wagon seat