[Catalyst] Pluggable Application Modules - Newbie question

[Jason Crummack]

Hi,

We're just about to begin several new website projects and I'm currently 
evaluating catalyst, I've gone through the tutorial and so far all seems 
straight forward.

I only have one question before I begin, I'd like to have several sub 
projects (user, cart, forums, etc...) I'd like each of these to be 
boiler plates to be utilized within several websites, each boiler plate 
would have its own configuration file which controls the level / levels 
of functionality provided. There would obviously need to be some level 
of interaction between certain modules (checking a user is logged before 
cashing out his cart etc..), yet others (forums) may not be required on 
specific sites.

What best practices would you recommend for this in catalyst?

Many Thanks

Jason Crummack