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Main idea - don't implement stance control but add posibility to look over the cover or see through the holes in sandbags, when the surface is uneven.
Usually i plant sandbags without windows/holes, and over it - sandbag with embrasures.
The person height is not enough to use it, so i plant concrete barier to jump on it, but still time to time you need to stay closer or further of the wall to catch the point.
I noticed that that is never happened if you place the wall something near foot ladder where i can move forward/backward to reach upper/lower position.
So the thing is like an addition to buildable things, small/high wall, small/high crate, fence/camo-fence and the ramp.