There is little info and depending on what state you live in, it will be very difficult to title the boat for public waters. Sadly, without the help of a friend who was a politician, I would NEVER have gotten a title and the beaurocrats would have sent her to the scrapper. Just wanted to bring it up before you spend a lot of money. hopefully it isn't a problem for you.
Try googling every combination of the words Mckenzie, Cherokee, boat manufacturing etc... and you will get a few images that will help, mostly from this forum! I will answer everything that I can. The transom should be fairly straight forward without the splash well. If you post more shots of your floor trusses, I can help you work out the original seat/ floor configuration.
I lucked out and mine never leaked a drop, so no experience with serious riveting.
Keep after it,
Dale