Getting into contruct skybox without noclip

I saw some guy did it, he welded a chair to a an object with thursters and somehow went into the map and went into the skybox.

At first I thought it was nocollide but than nocollide only works on props.

This was a vanilla gmod server so no world nocollide…

Any help would be appreciated.

http://img710.imageshack.us/img710/1263/gmconstruct0001.th.jpg
http://img696.imageshack.us/img696/1663/gmconstruct0002.th.jpg
http://img705.imageshack.us/img705/9229/gmconstruct0005s.th.jpg

Advanced ballsocket with nocollide on and free movement on.

And this lets me(prop) go through the map?

Yes, Adv. Ball Socketing something to the world, with nocollide and free movement on allows it to move through the world.

Thanks guys, help appreciated!