That not the one I use.
GOOGLE SKETCHUP!!! MUHAHAHAHAAA!
Download and install Google Sketchup
http://www.sketchup.google.com or direct link
http://sketchup.google.com/download/gsu.htmlThen start Sketchup and set your measurement to foot and inches, and press "start using sketchup".
Exit Sketchup
Goto:
C:\Steam\SteamApps\yourname\sourcesdk\sketchup
Move all the files except "readme" and the "online help" to C:\Program Files (x86)\Google\Google SketchUp 7\Plugins
Start Sketchup
Remove "the guy" and make a small box and select the whole box.
Make it a group!! You have to do it on all stuffz!! (but only on a single thing. Example don't group a box
and a pyramid!!!)
Go to the Plugins tab and press Export to vmf
Save the file as [filename].vmf (you have to add the vmf!!)
Start Hammer!!!
Open your vmf file
See your box with a basic texture on it. (Some stuffs will automatically be added. Like: env_sun, light_environment, and info_player_start)
Sketchup can't convert everything and you will get a warning. If you make your thing (Skybox!) Too big it will give you a warning.
Max size is 2500
ftIf you're having problems please feel free to ask. If you really want me to, I can make a video tutorial in HD.