If you have an old laptop with a non FHD screen, look no further!
I would have made a tutorial, but it's pretty much self explainatory.
Just remove the old screen and there you go, you can use the keyboard and trackpad while infront of a monitor.
Laptop will still boot up and it doesn't look half bad.
*WARNING* You will lose the ability to use wifi, webcam, and/or microphone(s) in the process.