Sorry, but a MB, screen and kbd replacement sounds a little over the top. You will still have a 7 yo laptop without a warranty, and there is not much more to replace.
Beside that, I have not found replacements for a MB are upgrades as in more powerful and more features. You might get a backlit kbd as an upgrade and you may be able to upgrade the screen, but if you can’t find all those things together as compatible, I wouldn’t advise it.