I read an announcement for this website on AHF, so took a look. He has a lot of material on the R.E. based on the Formazioni di guerra, etc., that he had collected over the years. Unfortunately he has not posted the actual FdGs but a tabular recap of them. For me, his list of sources include the FdGs and on which rolls of T-821 they were found was quite useful. I have reached out to him and I will see what is possible.
Tactical Organizations in World War II
Pista! Jeff
Tactical Organizations in World War II
Pista! Jeff