Whilst i would normally mock people who people who post this sort of statement as in denial about their hobby men child, This is good advice to take onboard. it can be very easy to do a lot of damage to these models with even a modest drop and at that point it will be a write off for most people. if your son is already into models this may be a non issue but its worth consideration.
Wrong sound chip on that loco? better call wheeltappers!