You want forts? Have your squad dig and assemble them out of dirt, mud, sandbags and branches.
Thats a fuckin' milsim fort.
I agree with Brian, while structures can be nice... as soon as you have a couple the fighting begins to center around them. I've been longing to attend another completely greenside op with just a forest as your AO. That would be 'rad.
Guardians of Asgaard - KF25 -
Primaries: LCT AS VAL, LCT AKS74UN, VFC M4 CQB Mk2
Secondary: Latino heat, TM Glock 17