Clockwork planets (3)

I have finally grabbed the time to do some more on this set of scenery. I now have two hills, half a dozen barricades, a set of pipes and a watch-tower.

The pipes were just narrow drainpipe sections with a bit of grating in the front; the watchtower was more grating and K'nex. All very quick and simple. I will be making some LOS blocking scenery at some point, but I need to come up with some ideas...