At our field the instructors ask the tough questions and if you don't know the answers then they have you check. As an example what is the voltage reading on your flight pack? What is the reading on your transmitter? If they can't tell you and they have to check they either didn't do it or pay attention. Remember its not just the student and the plane you are protecting it is also everyone else including theat little kid and future flyer in the field. If they have to pop off a wing or pull a hatch at the least it gets them in the habit. Also every new plane has to get a preflight before you can even start the engine the first time or it doesn't fly. If you emphazise saftey it becomes second nature for the new pilots, full scale pilot instructors demain it we should too. The AMA saftey code doesn't say do it if its convienient it says do it!