Help needed with Joints and Motion Links

I am making a prototype train for an assignment, and I have built something basic already. I messed up some joints and therefore the motion links too. Do you think it would be better to just delete all joints and re-do them? Is it even possible?

https://preview.redd.it/mzpednfz9gae1.png?width=1920&format=png&auto=webp&s=cda059660d5a49b89268f95068348293626f943b