Welcome to the forum, you'll find quite a few of us old-toppies here, myself included. I'm sure you'll find the hobby has changed a lot since those early days, but one thing hasn't changed is the enjoyment. I echo what Patrick said above that you or your grandson will need the Hurricane, Me 109, etc, just be warneed you could easily have a tiger-by-it's-tail. Looking forward to reading about your adventures and hopefully seeing some results.
Remember we do this for fun John the Pom