How to have players build bases like this?

[magicalflump 1]

I have been watching videos from ShackTac like this one:

And as you can see the players can create bag fences and bunkers ect, but not in the Warfare style construction interface.

How can i do this in my mission?

Thanks

[kylania 546]

That's the ACE Mod.

[magicalflump 1]

That's the ACE Mod.

I have ACE, (got it recently) But how do i do that?