[Pharo-users] Job for Spec & Roassal?

Hello, I've been reading over the documentation and want to try my first project with Pharo. The project will begin as a simple diagramming program for making logic models<http://ctb.ku.edu/en/table-of-contents/overview/models-for-community-health-...>. Are there any similar projects or demos I should look at? As I progress with Pharo, I intend for the diagram elements to carry a lot of built-in functionality and data for program evaluation. Would I build the interface with Spec and the diagramming elements with Roassal? So, clicking a Spec button would create a Roassal object? -david