Even if out of 500 submissions only *five* are selected, that will still be too many. We need a terrain for the MA, the SEA, the HA

, and the TA. Anything more than that and yer gonna have people split up in many different arenas, with low numbers in each.
I reckon the main use of these terrains will be for special events. Er... and H2H.
I wonder though... Say someone comes up with a scenario (etc.), and books the SEA for a couple of hours on the weekend to run it. How hard/easy will it be for a CM to switch the terrain to a custom one, then switch it back once the event is over?