How to organize a gae + gwt project into modules

Hi, i would like to know if someone can recommends me a tutorial to
organize my project, or if can explain me how can i do it.

In my project i need this modules:

a) Core (entities classes + daos)
b) Backend (gwt module where the users can admin their app data, the
user must be logued)
c) Widgets (gwt module that loads an id in the url and displays a
widget that the users can put in their webpages, no need to be logued
to display the widget)
d) Restlet API 1 (an api that the users can use, i'm thinking to
develop this api with http://blog.noelios.com/2009/04/11/restlet-in-the-cloud-with-google-app-engine/)
e) Restlet API 2 (another resltlet api for other purposes)

Modules b, c, d, e will load module a (Core).

And nothing else :)

Can someone give me an idea about how to organize the proyect?

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