I really wanted to make the lights jump pads, but they just didn't work. Made a brush, made an info_null, targeted the brush to the null, and nothing happened. Also, the waterfall thing is in there just for kicks. You'd have to be stupid to do that in an actual game.
Also, about the fences. Without them, it's way to easy to get to your base. So, now, you can jump across the river, at some risk, you can go to your base and teleport around, which is stupid, but you won't fall. Finally, you could jump around the fence. Fast, but have fun falling off. And you can get out of the water, if you just get on a rock.
And from me, you really can't expect good brushwork. It looks fine if you don't look too close, and that's fine with me.
And in case you haven't noticed, I strive for uniqueness.