The rotating turret base is not exaclty like the modern Katyusha assembly, but rather has influences from other truck mounted weaponry, without the various hand cranks and levers. The boxes/plates on the sides are ideal for remap, but then you could opt to make the black frames on the missile tubes remap instead, lotsa options.
This would be good for a guerilla army in a mod... or even as crategoodie
TurretOffset=-100













