I know they can't right now. But the advanced combat fabbers can, along with other defensive structures. It'd be awesome, though, if the basic combat fabber could build walls. It's not a point defense solution so much as a hardening of a line (during an offensive push and/or a defensive stand). I think it would make the basic combat fabber much more worth the build. It would make early offensive pushes much more interesting, and it would make it easier to build defensive lines in response to offensive pushes. Thoughts?