I made some additions in models.py. The class SizeSpecificDoseEstimation seems to be more appropriate than CtDoseCheckDetails seen the additions in CP 1525.
To extract the information changes are needed in rdsr.py (also to get the Dose Check Details). Do you want these changes also in this issue (#465) or in a separate (new) issue?
Btw. I don't have a CT Dose SR with water equivalent detail data (except for some patient diameters in private codings). Do you (or someone else) have any for testing purposes?