As you would probably know, I have been using both genuine Weber IDF carbys and Weber IDF "style" carbys for many years now and have also recently brought out my own RPR Weber IDF carby range:

RPR Carburettor Kits

I have found a very good set of PDF files that show an exploded view of the following Weber carbys:

Weber 40 IDF

Weber 44 IDF

Weber 48 IDF

Weber 48 IDA