Here's my second go at an MP map. It's a bit more ambitious, with lots of destroyed buildings. Fiddling about with all the structural damage was exhausting.
I also put some streetlights in, but they all lit up without warning when I finished. I'd rather they were off since the power's supposed to be out, but I don't know how (or why they turned on suddenly).
update: nvm, turns out they are off when you actually play it.
Right, I've made some big changes to this map. An extra point has been added in the fields, others have been moved around, some tall buildings that obscured the view have gone, the night-time atmosphere has been improved (thank you Seb) and I've added some smoke and fire effects. This is what it looks like now: