1. I used a set of 5 brushes for my sky texture. My map is rectangular so I just pretty much made a half cub and hollowed it, leaveing 4 sides and a top.
The top and the two longest sides work great, but the two smaller sides show what you see in the editor, the sky box texture...
2. I got the texture by pressing Shift+A but I will try that and see if it works...
And here is a new problem, I can't find the props that look like the METAL barrels.. I found wood but no metal...