I walked that area in July 1974! Don't recall any remains but then again I wasn't aware of any in that area at the time. My only recollection of that area is of a tall pole with wedge shaped foot steps to enable you to climb it. We were told it was a Home Guard lookout.
On second thoughts maybe we didn't past the houses. Was there a pub there (three of us were over 18 then)?
You didn't get to Chale and photgraph the suspected markers shelter there?