I was going to edit and polish all the missions, but I figured that seeingas no-one else had made this yet, I decided I would have a go.
IT WILL NOT WORK WITH YOUR ORIGINIAL SAVE GAME. I would appreciate it if somebody could post this mod, with the updated main.scm and script.img, on GTAGarage, as I can't for some reason. To update the main.scm and the script.img