A1_Phoenix: Thanks for the info. I've pulled up a few websites and books which describe the differences between the Camel engines. If people are interested, I can look into make some additional slots (e.g. we already have a Clerget, maybe Le Rhone, Gnome and a RNAS 2F1 with Bentley).
The only thing that may be difficult to model is the use of throttle on some of these machines. Unlike more modern carburettors which keep very fine control over mixture/throttle, you had to have the throttle/mixture perfectly matched on these rotaries otherwise they would cut out.