Yeah, spot on with the dozer blades. Same parts that I used on the other two (that's me out of old style dozer blades now!).
Not sure about the rail thing, I was playing around with some bits; the little ladder fits over the top and they wedge all the stowage in well. They may stay . . .
Got a nice gun shield, for one of the stubbers, from a 1/35 scale tank kit