I think you should be very happy with it given the price, and given your low expectations for the watch, maybe there's no reason to pick the watch apart further. If you are interested in the origins of the various parts, I'm sure you can gradually develop deep knowledge and expertise about this reference. It may seem like you can become an expert in a few days by reviewing some websites, but usually there are nuances that take some time to appreciate.
As you know, parts can be authentic, but not matching, and most members are not going to go into detail about potential inconsistencies in a situation like this, because it would sound like they are beating up a watch that was purchased for a good price and as a project. If they sense that you are adopting a defensive tone in your responses, they are certainly not going to engage. I will just say that the mismatched serial number alone is already a major flaw for most collectors, and once an issue like that is identified, it's very likely that other changes have been made. Combined with the damaged dial, there would be no reason for a collector to study it further unless they were considering the value of the parts, and I can't imagine that anyone is interested in arguing with you about it. Almost everyone would probably just advise you to enjoy the watch and not overthink it.