I actually owned a cement (concrete?)-cased piano.  This was a 5-foot
grand from the 1930s.  The case was grained and looked just like
veneer.  I may not have known it was cement except for a few dings
in the finish which revealed the white mortar.  It was heavy, but not
"nine-man" heavy.  I think I used three guys to move it.  A cheap
piano, but interesting.  I don't remember if it was a Lauter.

Philip Jamison