I came across this paper discussing the dimensions of Hemiunu's tomb -

[www.researchgate.net]

continued here -
[pdfs.semanticscholar.org]
- note that the author diverges into a discussion of the thick courses of Khufu casing.

I didn't get much from these articles. But it is interesting to note that Hemiunu's tomb is much larger than the regular mastabas of the Western Cemetery, most of which are said to date to the 5th and 6th dynasties. Yet his tomb, presumably of earlier date, was built far to the west. Could there be any significance to this siting?