That's going to be really cool.
A suggestion for the second turret. Don't cut off the back end of the guns where they attach to the turret, cut a section of the plain tube bit out and glue the muzzle back on. That way you keep all the detail of the recoil springs (or whatever they are) and you also have more feedom in how long you want the barrels to be.
A suggestion for the second turret. Don't cut off the back end of the guns where they attach to the turret, cut a section of the plain tube bit out and glue the muzzle back on. That way you keep all the detail of the recoil springs (or whatever they are) and you also have more feedom in how long you want the barrels to be.