How to get super big GMAN?
On gm_contruct, when you first spawn, use noclip mode and fly forward until you're outside the map, you'll see darkness, but some buildings far in front of you, go to them, then place anything in that area with the buildings, you may wanna keep a camera inside gm_construct so it's easier for you to see where you're placing stuff, so you don't have to keep noclipping from the inside of gm_construct to the small buildings outside gm_construct