to Sam2 and benignuman: I saw both the teshuvah by R’Moshe and had the good fortune to find the Chassam Sofer too. if you are able to see what R’Moshe zz’l actually wrote, it is a confusing teshuvoh. He starts by maintaning that we measure according the the people of the time asnd then concludes that the people-throughout all the centuries, dor hamidbor, gemoro times, our times- have not changed and hence, we have the same measurements. Confusing, at least to me.
He concludes that he made many measurements and that an “amoh’ would be between 21.5 inches and 23 inches. (here you have a source for the 66 inch mechitzah). I must say that -as I wrote- if you accept the tosfos opinion that a person is 4 amos tall- it seems totally out of proportion to reality- even t 21.5, the height of a prson would be 86 inches- seven feet tall!