There are bound to be so entries and that on the thin red line between diorama or not.

Build it as you like and if it's really close the staff will debate it.

If you build a chopper on a heli pad, that's one thing. If there's a mechanic or a pilot standing beside it or a medic, then that's another.

I know this is a gray area and that's why : Vehicle plus basic ground is not dio, add a figure and it is. We gotta draw a line somewhere and that's where my pencil went.

If you want to add a figure just take a pic before you add it. No biggy.