I'm talkin' "Cool breeze, man..". Easy money...
No, I don't have plans, I just use the ol' Super-Calibrated Mk I Eyeball when building structures... I use a figure from the scale I want as a "yardstick, like for 1/48th, I figure that since the height of a standard Monogram figure is 1 1/2 inches, or 72 scale inches, I can use that to roughly measure out any structual dimensions... I mean, it's a revetment, not a watch, so eyeballing it is close enough for government work, knowwhutImean?
Never buy what you can build, that's m' motto, lol...
For the steel revetment wall-sections, I'd just build a "box" of styrene from a couple "Garage Sale"-type signs (my favorite sheet styrene source), glue strips of styrene cut form the signs on the front and sides, and then just sprinkle a litte "earth" along the top over the styrene "cap", which I'd glue about a fat 1/8th inch down inside... Then I just keep building those boxes until I have enough to revet the entire area I'm working..
There were concrete revetments too, as well as sand-filled fuel drums too.. It all depends on what you want to model... I'd make a mold-box for the concrete ones and cast them in plaster, or for the drums, make a "master" out of something like the Tamiya fuel drum set, then cast as many drum-sections in resin as I need, gluing them together and "filling" the top ones with dirt...