I have an old CD to use as a base, foamcore to make a building and corrugated card for a roof. A privet hedge cutting will form the trunk of a tree. I'll dig out a coffee stirrer or bit of plastic girder for the road barrier. Mustn't forget a figure too, maybe a bored guard standing in the shade. I have a few suitable candidate figures in mind.
I'd like it to be more than just a checkpoint, a few minutes to sketch out ideas and this is what I have so far...
It'll make a good objective marker too. Just over a week left to pull my finger out and actually start constructing it, I sense a busy weekend coming!