Well there is restoration and there is restoration......... However, you are right, it is not easy at all, especially from a wreck.
To my mind, it is better to spend a few years gathering all the parts before sarting the restoration but that is just the way I do it. Other restoration methods are available! Of course, it is not always possible to find everything, it is often a question of compromise.....
P.S. I'd like to borrow that travel lock to copy if I may please!