When I was in the TA at RAF Leeming at the station open days. We did this sort of thing but for all the visitors.
The visitors could have a look at any of the kit the RAF could put together but it was a case of don't touch this Don't touch that etc.
When they came to our stuff, big heavy dirty plants of plant and tippers, the kids started off scared to touch anything until we said you can pull, push bang anything you want to. If we can't break it you won't.
The kids loved it.
Would I do it again, Yes like a shot.
Only trouble is too far from you Rosie.