after getting all inspired by Gruntz, I found a vendor called Mad Mecha guy who makes really nice MDF terrain in a few different scales.
So, a quick order later and this is what I got for £27. Now to paint them up
8 solar panels, they have removable bases so you can turn the panels around
15 cargo containers, 5 x 9cm long ones and 10 x 7cm long ones. You can make them up with the doors open or closed.
8 x 8cm long billboards. I added the base as I ordered ones that were meant to be attached to a building.
3 x helo pads