Hi,
I run an Air Scout and we have 2 P3D setups.
I am looking to take their use to the next level, such as, airport circuits, atc, adding faults/problems, etc…
How can I do it and what do you think would be more interesting to 10-14 year olds.
Maybe a sponsored flight across the pond taking shifts overnight?
I organised a “challenge” for my squadron a few weeks back. If you want a copy then send me a message 
I’m not familiar with P3D, more FSX and XPlane, but you could set up an air traffic control station or two, then run scenarios etc
On a military thene
One squadron I know runs scenarios where a foreign military aircraft enters UK airspace and the cadets are “scrambled” to their stations to take off and escort the foreign aircraft out if airspace.
Could you kindly explain how to set up ATC stations? I’ve been wanting to do that for a while.
Again, unfortunately not familiar with P3D, but this seems to be what you want.
http://www.flight1.com/products.asp?product=atcpro
There are probably others out there too.
This looks fun