Yes indeed it would, or at least I don't see any problem with it. As long as there is some common link between them, I don't see a problem with doing all the sequels.
I think if there is lots of info like your Ilsa collection it deserves to be in the section. I like the idea of mini plot summaries and biographies.
So IMO you don't need to do any mega collections like my upcoming "The Empire Definitive Guide to horror" which I'm typing up when I have the spare moment [read: about 138 pages of reviews for the greatest horror movies according to Empire film magazine]
A short and sweet collection thread is fine
I don't think TV series should qualify as a collection though, and not any mini-series ie. Jeepers Creepers, Scream.
About 3+ movie imo